Publications of Prof. Dr. P. Gegenwart
2013
Tokiwa, Y., Garst, M., Gegenwart, P., Bud'ko, S.L., Canfield, P.C. Quantum Bicriticality in the Heavy-Fermion Metamagnet YbAgGe.Phys. Rev. Lett. 111 (2013)116401.
Tokiwa, Y., Bauer, E.D., Gegenwart, P. Zero-Field Quantum Critical Point in CeCoIn5. Phys. Rev. Lett. 111 (2013) 107003.
Pfau, H., Daou, R., Lausberg, S., Naren, H.R., Brando, M., Friedemann, S., Wirth, S., Westerkamp, T., Stockert, U., Gegenwart, P., Krellner, C., Geibel, C., Zwicknagl, G., Steglich, F.Interplay between Kondo Suppression and Lifshitz Transitions in YbRh2Si2 at High Magnetic Fields. Phys. Rev. Lett. 110 (2013)256403.
Zapf, S. Jeevan, H.S., Ivek, T., Pfister, F., Klingert, F., Jiang, S., Wu, D., Gegenwart, P., Kremer, R.K., Dressel, M. EuFe2(As1-xPx)2: Reentrant Spin Glass and Superconductivity.Phys. Rev. Lett. 110 (2013)237002.
Dong, J.K., Tokiwa, Y., Bud'ko, S.L., Canfield, P.C., Gegenwart, P. Anomalous Reduction of the Lorenz Ratio at the Quantum Critical Point in YbAgGe.Phys. Rev. Lett. 110 (2013)176402.
Jiang, S., Jeevan, H.S., Dong, J., Gegenwart, P. Thermopower as a Sensitive Probe of Electronic Nematicity in Iron Pnictides. Phys. Rev. Lett. 110 (2013)067001.
Gretarsson, H., Clancy, J.P., Liu, X., Hill, J.P., Bozin, E., Singh, Y., Manni, S., Gegenwart, P., Kim, J., Said, A.H., Casa, D., Gog, T., Upton, M.H., Kim, H.S., Yu, J., Katukuri, V.M., Hozoi, L., van den Brink, J., Kim, Y.J. Crystal-Field Splitting and Correlation Effect on the Electronic Structure of A2IrO3. Phys. Rev. Lett. 110 (2013) 076402.
Mazin, I. I., Manni, S., Foyevtsova, K., Jeschke, H.O., Gegenwart, P., Valenti, R. Origin of the insulating state in honeycomb iridates and rhodates.Phys. Rev. B 88 (2013) 035115.
Gretarsson, H., Clancy, J.P., Singh, Y., Gegenwart, P., Hill, J.P., Kim, J., Upton, M.H., Said, A.H., Casa, D., Gog, T., Kim, Y.J.Magnetic excitation spectrum of Na2IrO3 probed with resonant inelastic x-ray scattering. Phys. Rev. B 87 (2013) 220407.
Gasparov, V.A., Audouard, A., Drigo, L., Rodigin, A.I., Lin, C.T., Liu, W.P., Zhang, M., Wang, A.F., Chen, X.H., Jeevan, H.S., Maiwald, J., Gegenwart, P. Upper critical magnetic field of KxFe2-ySe2 and Eu0.5K0.5Fe2As2 single crystals. Phys. Rev. B 87 (2013) 094508.
Avigo, I., Cortes, R., Rettig, L., Thirupathaiah, S., Jeevan, H.S., Gegenwart, P., Wolf, T., Ligges, M., Wolf, M., Fink, J., Bovensiepen, U. Coherent excitations and electron-phonon coupling in Ba/EuFe2As2 compounds investigated by femtosecond time-and angle-resolved photoemission spectroscopy.J. Phys.: Condens. Matter 25 (2013) 094003.
Rettig, L., Cortes, R., Jeevan, H.S., Gegenwart, P., Wolf, T., Fink, J., Bovensiepen, U. Electron-phonon coupling in 122 Fe pnictides analyzed by femtosecond time-resolved photoemission.New Journal of Physics15 (2013) 083023.
Stingl, C., Perry, R.S., Maeno, Y., Gegenwart, P. Electronic nematicity and its relation to quantum criticality in Sr3Ru2O7 studied by thermal expansion. Phys. Stat. Sol. B 250 (2013) 450.
Brando, M., Pedrero, L., Westerkamp, T., Krellner, C., Gegenwart, P., Geibel, C., Steglich, F. Magnetization study of the energy scales in YbRh2Si2 under chemical pressure.Phys. Stat. Sol. B 250 (2013) 485.
Sichelschmidt, J., Jeevan, H.S., Mchalwat, M., Gegenwart, P. Electron spin resonance of the Yb 4f-moment in Yb(Rh1-xFex)2Si2. Phys. Stat. Sol. B 250 (2013) 495.
2012
Rettig, L.,Cortés, R., Thirupathaiah, S., Gegenwart, P., Jeevan, H.S.,Wolf, M., Fink, J., Bovensiepen, U. Ultrafast momentum-dependent response of electrons in antiferromagnetic EuFe2As2 driven by optical excitation. Phys. Rev. Lett. 108 (2012) 097002.
Singh, Yogesh, Manni, S., Reuther, J., Berlijn, T., Thomale, R., Ku, W., Trebst, S., Gegenwart, P. Relevance of the Heisenberg-Kitaev model for the honeycomb lattice Iridates A2IrO3. Phys. Rev. Lett. 108 (2012) 127203.
Choi, S .K., Coldea, R., Kolmogorov,A.N., Lancaster, T., Mazin, I.I., Blundell, S.J., Radaelli, P.G., Singh. Yogesh, Gegenwart, P. Choi, K.R., Cheong, S.-W., Baker, P.J., Stock, C., Taylor, J. Spinwaves and revised crystal structure of honeycomb Iridate Na2IrO3. Phys. Rev. Lett. 108 (2012) 127204.
Comin, R., Levy, G., Ludbrook, B., Zhu,Z.-H., Veenstra, C.N.,Rosen, J.A.,Singh, Yogesh, Gegenwart, P. Stricker, D., Hancock, J.N., van der Marel, D., Elfimov, I.S., Damascelli, A.Na2IrO3 as a Novel Relativistic Mott Insulator with a 340-meV Gap. Phys. Rev. Lett. 109 (2012)266406.
Maiwald, J., Jeevan, H.S., Gegenwart, P. Signatures of quantum criticality in hole-doped and chemically pressurized EuFe2As2 single crystals. Phys. Rev. B 85 (2012) 024511.
Sarkar, R., Nath, R., Khuntia, P., Jeevan, H.S., Gegenwart, P., Baenitz, M. Magnetism and superconductivity in Eu0.2Sr0.8(Fe0.86Co0.14)2As2 probed by 75As NMR. J. Phys.: Condens. Matter 24 (2012) 045702.
Tokiwa, Y., Bauer, E.D., Gegenwart, P. Quasiparticle Entropy in the High-Field Superconducting Phase of CeCoIn5. Phys. Rev. Lett. 109 (2012) 116402.
von Nidda, H.-A., Kraus, S., Schaile, S., Dengler, E., Pascher, N., Hemmida, M., Eom, M.J., Kim, J.S., Jeevan, H.S., Gegenwart, P., Deisenhofer, J., Loidl, A. Electron spin resonance in Eu-based iron pnictides. Phys. Rev. B 86 (2012) 094411.
Antal, A., Knoblauch, T., Singh, Y., Gegenwart, P., Wu, D., Dressel, M. Optical properties of the iron-pnictide analog BaMn2As2. Phys. Rev. B 86 (2012) 014506.
Tokiwa, Y., Hübner, S.-H., Beck, O., Jeevan, H.S., Gegenwart, P. Unique phase diagram with narrow superconducting dome in EuFe2(As1−xPx)2 due toEu2+ local magnetic moments. Phys. Rev. B 86 (2012)220505(R).
2011
Stingl, C., Perry, R.S., Maeno, Y., Gegenwart, P. Symmetry-Breaking Lattice Distortion in Sr3Ru2O7. Phys. Rev. Lett. 107 (2011) 026404.
Liu, X., Berlijn, T., Yin, W.G., Ku, W., Tsvelik, A., Kim, Y.J., Gretarsson, H., Singh, Y., Gegenwart, P., Hill, J.P. Long-range magnetic ordering in Na2IrO3. Phys. Rev. B 83 (2011) 220403.
Tokiwa, Y., Gegenwart, P., Gnida, D., Kaczorowski, D. Quantum criticality near the upper critical field of Ce2PdIn8. Phys. Rev. B 84 (2011) 140507.
Tokiwa, Y., Gegenwart, P. High-resolution alternating-field technique to determine the magnetocaloric effect of metals down to very low temperatures. Rev. Sci. Instr. 82 (2011) 013905.
Jeevan, H.S., Kasinathan, D., Rosner, H., Gegenwart, P. Interplay of antiferromagnetism, ferromagnetism, and superconductivity in EuFe2(As1-xPx)2 single crystals. Phys. Rev. B 83 (2011) 054511.
Wu, D., Chanda, G., Jeevan, H.S., Gegenwart, P., Dressel, M. Optical investigations of chemically pressurized EuFe2(As1-xPx)2: An s-wave superconductor with strong interband interactions. Phys. Rev. B 83 (2011) 100503.
Thirupathaiah, S., Rienks, E.D.L., Jeevan, H.S., Ovsyannikov, R., Slooten, E., Kaas, J., van Heumen, E., de Jong, S., Dürr, H.A., Siemensmeyer, K., Follath, R., Gegenwart, P., Golden, M.S., Fink, J. Dissimilarities between the electronic structure of chemically doped and chemically pressurized iron pnictides from an angle-resolved photoemission spectroscopy study. Phys. Rev. B 84 (2011) 014531.
2010
Singh, Y., Gegenwart, P. Antiferromagnetic Mott insulating state in single crystals of the honeycomb lattice material Na2IrO3. Phys. Rev. B 82 (2010) 064412.
Custers, J., Gegenwart, P., Geibel, C., Steglich, F., Coleman, P., Paschen, S. Evidence for a Non-Fermi-Liquid Phase in Ge-Substituted YbRh2Si2. Phys. Rev. Lett. 104 (2010) 186402.
Mercure, J.F., Rost, A.W., O'Farrell, E.C.T., Goh, S.K., Perry, R.S., Sutherland, M.L., Grigera, S.A., Borzi, R.A., Gegenwart, P., Gibbs, A.S., Mackenzie, A.P. Quantum oscillations near the metamagnetic transition in Sr3Ru2O7. Phys. Rev. B 81 (2010) 235103.
Weickert, F., Brando, M., Steglich, F., Gegenwart, P., Garst, M. Universal signatures of the metamagnetic quantum critical endpoint: Application to CeRu2Si2. Phys. Rev. B 81 (2010) 134438.
Pascher, N., Deisenhofer, J., von Nidda, H.-A., Hemmida, M., Jeevan, H.S., Gegenwart, P., Loidl, A. Magnetic fluctuations and superconductivity in iron pnictides as probed by electron spin resonance. Phys.Rev. B 82 (2010) 054525.
Friedemann, S., Westerkamp, T., Brando, M., Oeschler, N., Gegenwart, P., Krellner, C., Geibel, C., MaQuilon, S., Fisk, Z., Steglich, F., Wirth, S. Magnetic and Electronic Quantum Criticality in YbRh2Si2. J. Low Temp. Phys. 161, 67 (2010).
Gegenwart, P., Tokiwa, Y., Donath, J.G., Küchler, R., Bergmann, C., Jeevan, H.S., Bauer, E.D., Sarrao, J.L., Geibel, C., Steglich, F. Divergence of the Gruneisen Parameter and Magnetocaloric Effect at Heavy Fermion Quantum Critical Points. J. Low Temp. Phys. 161, 117 (2010).
Stingl, C., Perry, R.S., Maeno, Y., Gegenwart, P. Anisotropy of the low-temperature magnetostriction of Sr3Ru2O7. Phys. Stat. Sol. B 247 (2010) 574.
Schneider, M., Moshnyaga, V., Gegenwart, P. Ferromagnetic quantum phase transition in Sr1-xCaxRuO3 thin films. Phys. Stat. Sol. B 247 (2010) 577.
Bergmann, C., Jeevan, H.S., Schubert, M., Geibel, C., Gegenwart, P. Single crystal growth of CeNi2Ge2 using the floating zone technique. Phys. Stat. Sol. B 247 (2010) 694.
Steglich, F., Arndt, J., Friedemann, S., Krellner, C., Tokiwa, Y., Westerkamp, T., Brando, M., Gegenwart, P., Geibel, C., Wirth, S., Stockert, O. Superconductivity versus quantum criticality: what can we learn from heavy fermions? J. Phys. Condens. Matter 22 (2010) 164202.
de Jong, S., van Heumen, E., Thirupathaiah, S., Huisman, R., Massee, F., Goedkoop, J.B., Ovsyannikov, R., Fink, J., Durr, H.A., Gloskovskii, A., Jeevan, H.S., Gegenwart, P., Erb, A., Patthey, L., Shi, M., Follath, R., Varykhalov, A., Golden, M.S. Droplet-like Fermi surfaces in the anti-ferromagnetic phase of EuFe2As2, an Fe-pnictide superconductor parent compound. Eur. Phys. Lett. 89 (2010) 27077.
2009
Tokiwa, Y., Gegenwart, P., Geibel, C., Steglich, F. Separation of energy scales in undoped YbRh2Si2 under hydrostatic pressure. J. Phys. Soc. Jpn. 78 (2009) 123708.
Donath, J.G., Steglich, F., Bauer, E.D., Ronning, F., Sarrao, J.L., Gegenwart, P. Quantum criticality in layered CeRhIn5−xSnx compared with cubic CeIn3−xSnx. Eur. Phys. Lett. 87 (2009) 57011.
Friedemann, S., Westerkamp, T., Brando, M., Oeschler, N., Wirth, S., Gegenwart, P., Krellner, C., Geibel, C., Steglich, F. Detaching the antiferromagnetic quantum critcial point from the Fermi surface reconstruction in YbRh2Si2. Nature Phys. 5 (2009) 465.
Tokiwa, Y., Radu, T., Geibel, C., Steglich, F., Gegenwart, P. Divergence of the Magnetic Gruneisen Ratio at the Field-Induced Quantum Critical Point in YbRh2Si2. Phys. Rev. Lett. 102, 066401 (2009).
Westerkamp, T., Deppe, M., Küchler, R., Brando, M., Geibel, C., Gegenwart, P., Pikul, A.P., Steglich, F. Kondo-Cluster-Glass State near a Ferromagnetic Quantum Phase Transition. Phys. Rev. Lett. 102 (2009) 206404.
Mercure, J.-F., Goh, S.K., O’Farrell, E.T.C., Perry, R.S., Sutherland, M.L., Rost, A.W., Grigera, S.A., Borzi, R.A., Gegenwart, P., Mackenzie, A.P. Quantum Oscillations in the Anomalous Phase in Sr3Ru2O7. Phys. Rev. Lett. 103 (2009) 176401.
Miclea, C.F., Nicklas, M., Jeevan, H.S., Kasinathan, D., Hossain, Z., Rosner, H., Gegenwart, P., Geibel, C., Steglich, F. Evidence for a reentrant superconducting state in EuFe2As2 under pressure. Phys. Rev. B 79 (2009) 212509.
Wu, D., Barišić, N., Drichko, N., Kaiser, S., Faridian, A., Dressel, M., Jiang, S., Ren, Z., Li, L.J., Cao, G.H., Xu, Z.A., Jeevan, H.S., Gegenwart, P. Effects of magnetic ordering on dynamical conductivity: Optical investigations of EuFe2As2 single crystals. Phys. Rev B 79 (2009) 155103.
Matysiak, R., Kamieniarz, G., Gegenwart, P., Ochiai, A. Field-dependent specific heat of Yb4As3: Agreement between a spin- model and experiment. Phys. Rev B 79 (2009) 224413.
Peyker, L., Gold, C., Scheidt, E.-W., Scherer, W., Donath, J.G., Gegenwart, P. Mayr, F., Unruh, T., Eyert, V., Bauer, E., Michor, H. Evolution of quantum criticality in CeNi9-xCuxGe4. J. Phys.: Condens. Matter 21 (2009) 235604.
Gasparov V.A., Jeevan H.S., Gegenwart, P. Normal-state electrical resistivity and superconducting magnetic penetration depth in Eu0.5K0.5Fe2As2 polycrystals. JETP Lett. 89 (2009) 294.
2008
Gegenwart, P., Si, Q., Steglich, F. Quantum criticality in heavy-fermion metals. Nature Phys. 4, 186 (2008).
Donath, J.G., Steglich, F., Bauer, E.D., Sarrao, J.L., Gegenwart, P. Dimensional crossover of quantum critical behavior in CeCoIn5. Phys. Rev. Lett. 100, 136401 (2008).
Jeevan, H.S., Hossain, Z., Kasinathan, D., Rosner, H., Geibel, C., Gegenwart, P. Electrical resistivity and specific heat of single-crystalline EuFe2As2: A magnetic homologue of SrFe2As2. Phys. Rev. B 78, 052502 (2008).
Jeevan, H.S., Hossain, Z., Kasinathan, D., Rosner, H., Geibel, C., Gegenwart, P. High-temperature superconductivity in Eu0.5K0.5Fe2As2. Phys. Rev. B 78, 092406 (2008).
Donath, J.G., Gegenwart, P., Nicklas, M., Steglich, F., Pham, L.D., Fisk, Z. Pressure dependence of the Néel and the superconducting transition temperature of CeCo(In0.9Cd0.1)5 studied by thermal expansion. Physica B 403, 839 (2008).
Gegenwart, P., Westerkamp, T., Krellner, C., Brando, M., Tokiwa, Y., Geibel, C., Steglich, F. Unconventional quantum criticality in YbRh2Si2. Physica B 403, 1184 (2008).
Westerkamp, T., Gegenwart, P., Krellner, C., Geibel, C., Steglich, F. Low-temperature magnetic susceptibility of Yb(Rh2-xMx)2Si2 (M = Ir, Co) single crystals. Physica B 403, 1236 (2008).
2007
Gegenwart, P., Westerkamp, T., Krellner, C., Tokiwa, Y., Paschen, S., Geibel, C., Steglich, F., Abrahams, E. , Si, Q. Multiple energy scales at a quantum critical point. Science 315, 5814 (2007).
Sereni, J.G., Westerkamp T., Kuchler, R., Caroca-Canales N., Gegenwart, P., Geibel, C. Ferromagnetic quantum criticality in the alloy CePd1-xRhx. Phys. Rev. B 75, 024432 (2007).
Weickert, F., Gegenwart, P., Perry, R.S., Maeno, Y. Alternating-field magnetoresistance measurements on Sr3Ru2O7. Physica C 460, 520 (2007).
Donath, J.G., Gegenwart, P., Steglich, F., Bauer, E.D., Sarrao, J.L. Pressure effect on antiferromagnetism in CeRhIn5-xSnx studied by thermal expansion. Physica C 460, 661 (2007).
Matysiak, R., Kamieniarz, G., Gegenwart, P., Aoki, H., Ochiai, A. Field-dependent specific-heat of the pure and diluted 4f electron system Yb4As3. Inorg. Chim. Acta 360, 3955 (2007).
Radu, T., Tokiwa, Y., Coldea, R., Gegenwart, P., Tylczynski, Z., Steglich, F. Field induced magnetic phase transition as a magnon Bose Einstein condensation. Sci. Techn. Adv. Mat. 8, 406 (2007).
Küchler, R., Gegenwart, P., Geibel, C., Steglich, F. Systematic study of the Grüneisen ratio near quantum critical points. Sci. Techn. Adv. Mat. 8, 428 (2007).
2006
Weickert, F., Gegenwart, P., Won, H., Parker, D., Maki, K. In-plane angular dependence of the upper critical field in CeCoIn5. Phys. Rev. B 74, 134511 (2006).
Pikul A.P., Caroca-Canales, N., Deppe, M., Gegenwart, P., Sereni, J.G., Geibel, C., Steglich, F. Non-Fermi-liquid behaviour close to the disappearance of ferromagnetism in CePd1−xRhx, J. Phys.: Condens. Matter 18 (2006) L535.
Gegenwart, P., Weickert, F., Garst, M., Perry, R.S., Maeno, Y. Metamagnetic quantum criticality in Sr3Ru2O7 studied by thermal expansion, Phys. Rev. Lett. 96, 136402 (2006).
Küchler, R., Gegenwart, P., Custers, J., Stockert, O., Caroca-Canales, N., Geibel, C., Sereni, J.G., Steglich, F. Quantum criticality in the cubic heavy-fermion system CeIn3-xSnx, Phys. Rev. Lett. 96, 256403 (2006).
Tokiwa, Y., Pikul, A., Gegenwart, P., Steglich, F., Bud'ko, S.L., Canfield, P.C. Low temperature thermodynamic properties of the heavy fermion compound YbAgGe close to the field-induced quantum critical point, Phys. Rev. B 73, 094435 (2006)
Gegenwart, P. Tokiwa, Y., Westerkamp, T., Weickert, F., Custers, J., Ferstl, J., Krellner, C., Geibel, C., Kerschl, P., Müller, K.-H., Steglich, F. High-field phase diagram of the heavy-fermion metal YbRh2Si2, New Journal of Physics 8 (2006) 171.
Gegenwart, P.,Tokiwa, Y., Custers, J., Geibel, C., Steglich, F. Magnetic properties close to the quantum critical point in YbRh2Si2, J. Phys. Soc. Jpn. 75, Suppl. 155 (2006).
Küchler, R., Gegenwart, P., Weickert, F., Oeschler, N., Cichorek, C., Nicklas, M., Carocca-Canales, N., Geibel, C., Steglich, F. Thermal expansion and Grüneisen ratio near quantum critical points, Physica B 378–380, 36 (2006).
Weickert, F., Gegenwart, P., Ferstl, J., Geibel, C., Steglich, F. Low-temperature electrical resistivity of Yb1-xLaxRh2Si2, Physica B 378–380, 72 (2006).
Hossain, Z., Geibel, C., Radu, T., Tokiwa, Y., Weickert, F., Krellner, C., Jeevan, H., Gegenwart, P., Steglich, F. Low-temperature properties of the heavy fermion system YbIr2Si2. , Physica B 378–380, 74 (2006).
Donath, J.G., Gegenwart, P., Küchler, R., Oeschler, N., Steglich, F., Bauer, E.D., Sarrao, J.L. Pressure effect on superconductivity in CeCoIn5-xSnx studied by thermal expansion, Physica B 378–380, 98 (2006).
Gegenwart, P., Weickert, F., Garst, M., Perry, R.S., Maeno, Y. Low-temperature magnetostriction of Sr3Ru2O7, Physica B 378–380, 117 (2006).
Tokiwa, Y., Gegenwart, P., Hossain, Z., Ferstl, J., Sparn, G., Geibel, C., Steglich, F. Low-temperature high-field magnetization of YbRh2Si2 and YbIr2Si2 under hydrostatic pressure, Physica B 378–380, 746 (2006).
2005
Cichorek, T., Sanchez, A., Gegenwart, P., Weickert, F., Wojakowski, A., Henkie, Z., Auffermann, G., Paschen, S., Kniep, R. & Steglich, F. Two-Cannel Kondo Effect in Glass-Like ThAsSe, Phys. Rev. Lett. 94, 236603 (2005).
Tokiwa, Y. Gegenwart, P., Radu, T., Ferstl, J., Sparn, G., Geibel, C. & Steglich, F. Field-induced Suppression of the Heavy-Fermion State in YbRh2Si2. Phys. Rev. Lett. 94, 226402 (2005).
Gegenwart, P., Custers, J., Tokiwa, Y., Geibel, C. & Steglich, F. Ferromagnetic Quantum Critical Fluctuations in YbRh2(Si0.95Ge0.05)2. Phys. Rev. Lett. 94, 076402 (2005).
Hossain, Z., Geibel, C., Weickert, F., Radu, T., Tokiwa, T., Jeevan, H., Gegenwart, P. & Steglich, F. Yb-based heavy-fermion metal situated close to a quantum critical point. Phys. Rev. B 72, 094411 (2005).
Oeschler, N., Deppe, M., Lengyel, E., Borth, R., Gegenwart, P., Sparn, G., Geibel, C. & Steglich, F. Magnetic phase diagram of CeCu2(Si1-xGex)2 measured with low-temperature thermal expansion. Phys. Rev. B 71, 094409 (2005).
Kamieniarz, G., Matysiak, R., Gegenwart, P., Aoki, H. & Ochiai, A. Field-dependent specific heat and magnetization for the antiferromagnetic chain Yb4As3: simulation and experiments. J. Magn. Magn. Mat. 290-291, 353 (2005).
Tokiwa, Y., Gegenwart, P., Sparn, G., Ferstl, J., Geibel, C. & Steglich, F. Pressure dependence of the low-temperature magnetization of YbRh2Si2. Physica B 359-361, 29 (2005).
Küchler, R., Gegenwart, P., Heuser, K., Scheidt, E.-W., Stewart, G.R. & Steglich, F. Thermal expansion of CeCu5.8Ag0.2. Physica B 359-361, 53 (2005).
Weickert, F., Gegenwart, P., Mydosh, J.A., Steglich, F., Kanadani, C., Tabata, Y., Taniguchi, T. & Kawarazaki, S. Search for a quantum critical end-point in CeRu2(Si1-xGex)2. Physica B 359-361, 68 (2005).
Gegenwart, P., Tokiwa, Y., Neumaier, K., Geibel, C. & Steglich, F. Scaling of the magnetic entropy and magnetization in YbRh2(Si0.95Ge0.05)2. Physica B 359-361, 23 (2005).
Ferstl, J., Geibel, C., Weickert, F., Gegenwart, P., Radu, T., Lühmann T. & Steglich, F. Tuning YbRh2Si2 to a non-magnetic state by La-doping. Physica B 359-361, 26 (2005).
2004
Grigera, S.A., Gegenwart, P., Borzi, R.A., Weickert, F., Schofield, A.J., Perry, R.S., Tayama, T., Sakakibara, T., Maeno, Y., Green, A.G. & Mackenzie, A.P. Disorder-Sensitive Phase Formation Linked to Metamagnetic Quantum Criticality. Science 306, 1154 (2004).
Paschen, S., Lühmann, T., Wirth, S., Gegenwart, P., Trovarelli, O., Geibel, C., Steglich, F., Coleman, P. & Si, Q. Hall-effect evolution across a heavy-fermion quantum critical point. Nature 432, 881 (2004).
Küchler, R., Gegenwart, P., Heuser, K., Scheidt, E.-W., Stewart, G.R. & Steglich, F. Grüneisen Ratio Divergence at the Quantum Critical Point in CeCu6-xAgx. Phys. Rev. Lett. 93, 096402 (2004).
Won, H., Maki, K., Haas, S., Oeschler, N., Weickert, F. & Gegenwart, P. Upper critical field and Fulde-Ferrell-Larkin-Ovchinnikov State in CeCoIn5. Phys. Rev. B 69, 180504(R) (2004).
Oeschler, N., Gegenwart, P., Weickert, F., Thalmeier, P. & Steglich, F. B-T Phase Diagram of PrOs4Sb12 studied by low-temperature Thermal Expansion and Magnetostriction. Phys. Rev. B 69, 235108 (2004).
Gegenwart, P., Langhammer, C., Helfrich, R., Oeschler, N., Lang, M., Kim, J.S., Stewart, G.R. & Steglich, F. Non-Fermi liquid normal state of the Heavy Fermion superconductor UBe13. Physica C 408-410, 157 (2004).
Tokiwa, Y., Gegenwart, P., Weickert, F., Küchler, R., Custers, J., Ferstl, J., Geibel, C. & Steglich, F. Suppression of the Kondo state in YbRh2Si2 by large magnetic fields. J. Magn. Magn. Mat. 272-276, e87 (2004).
Küchler, R., Weickert, F., Gegenwart, P., Oeschler, N., Ferstl, J., Geibel, C. & Steglich, F. Low-temperature thermal expansion and magnetostriction of YbRh2(Si1-xGex)2 (x=0 and 0.05). J. Magn. Magn. Mat. 272-276, 229 (2004).
Cichorek, T., Henkie, Z., Custers, J., Gegenwart, P. & Steglich, F. TLS Kondo effect in structurally disordered ThAsSe. J. Magn. Magn. Mat. 272-276, 66 (2004).
Matysiak, R., Kamieniarz, G., Gegenwart, P. & Steglich, F. Antiferromagnetic interactions in the semimetallic Yb4As3: field-dependent specific heat and magnetization data. J. Magn. Magn. Mat. 272-276, 282 (2004).
2003
Custers, J., Gegenwart, P., Wilhelm, H., Neumaier, K., Tokiwa, Y., Trovarelli, O., Geibel, C., Steglich, F., Pépin, C. & Coleman, P. The break- up of heavy electrons at a quantum critical point. Nature 424, 524 (2003).
Küchler, R., Oeschler, N., Gegenwart, P., Cichorek, T., Neumaier, K., Tegus, O., Geibel, C., Mydosh, J.A., Steglich, F., Zhu, L. & Si, Q. Divergence of the Grüneisen Ratio at Quantum Critical Points in Heavy Fermion Metals. Phys. Rev. Lett. 91, 066405 (2003).
Oeschler, N., Gegenwart, P., Sparn, G., Steglich, F., Movshovich, R. & Sarrao, J.L. Uniaxial Pressure Effects on CeIrIn5 and CeCoIn5 studied by low-Temperature Thermal Expansion. Phys. Rev. Lett. 91, 076402 (2003).
Gegenwart, P., Custers, J., Tayama, T., Tenya, K., Geibel, C., Sparn, G., Harrison, N., Kerschl, P., Eckert, D., Müller, K.-H. & Steglich, F. Tuning Heavy Fermion Systems into Quantum Criticality by Magnetic Field. J. Low Temp. Phys. 133, 3 (2003).
Cichorek, T., Aoki, H., Custers, J., Gegenwart, P., Steglich, F., Henkie, Z., Bauer, E.D. & Maple, M.B. ThAsSe diamagnet: Evidence for a Kondo effect derived from structural two-level systems. Phys. Rev. B 68, 144411 (2003).
Steglich, F., Sato, N.K., Aso, N., Gegenwart, P., Custers, J., Neumaier, K., Wilhelm, H., Geibel, C. & Trovarelli, O. Recent trends in heavy-fermion physics. Physica B 329, 441 (2003).
Matysiak, R., Kamieniarz, G., Gegenwart, P., Aoki, H., Ochiai, A. & Steglich, F. The semimetallic S=1/2 antiferromagnetic chain Yb4As3: quantum transfer-matrix simulations and experimental field-dependent speciric-heat data. Phys. Stat. Sol. B 237, 549 (2003).
Gegenwart, P., Custers, J., Tayama, T., Tenya, K., Geibel, C., Trovarelli, O., Steglich, F. & Neumaier, K. Divergence of the heavy quasiparticle mass at the antiferromagnetic quantum critical point in YbRh2Si2. Acta Phys. Pol. B 34, 323 (2003).
Oeschler, N., Gegenwart, P., Steglich, F., Frederick, N.A., Bauer, E.D. & Maple M.B. Thermal expansion of the skutterudite superconductor PrOs4Sb12. Acta Phys. Pol. B 34, 959 (2003).
Tenya, K., Oeschler, N., Gegenwart, P., Steglich, F., Frederick, N.A., Bauer, E.D. & Maple, M.B. Low temperature magnetization of the skutterudite superconductor PrOs4Sb12. Acta Phys. Pol. B 34, 995 (2003).
Kaczorowski, D., Leithe-Jasper, A., Cichorek, T., Tenya, K., Custers, J., Gegenwart, P. & Grin, Y. Possible heavy-fermion behavior in a Heusler-type compound YbPd2Sb. Acta Phys. Pol. B 34, 1253 (2003).
Oeschler, N., Kromer, F., Tayama, T., Tenya, K., Gegenwart, P., Sparn, G., Steglich, F., Lang, M. & Stewart, G.R. UBe13: Prototype of a non-fermi-liquid superconductor. Acta Phys. Pol. B 34, 255 (2003).
Cichorek, T., Geibel, C., Carocca-Canales, N., Lühmann, T., Gegenwart, P. & Steglich, F. Low-temperature specific heat of slightly off-stoichiometric CeNi2Ge2. Acta Phys. Pol. B 34, 371 (2003).
2002
Gegenwart, P., Custers, J., Geibel, C., Neumaier, K., Tayama, T., Tenya, K., Trovarelli, O. & Steglich, F. Magnetic-field induced quantum critical point in YbRh2Si2. Phys. Rev. Lett. 89, 056402 (2002).
Bianchi, A., Movshovich, R., Oeschler, N., Gegenwart, P., Steglich, F., Thompson, J.D., Pagliuso, P.G. & Sarrao, J.L. First-order superconducting phase transition in CeCoIn5. Phys. Rev. Lett. 89, 137002 (2002).
Trovarelli, O., Custers, J., Gegenwart, P., Geibel, C., Hinze, P., Mederle, S., Sparn, G. & Steglich, F. Effect of Ge-doping and pressure in the vicinity of the QCP of YbRh2Si2. Physica B 312, 401 (2002).
Gegenwart, P., Aoki, H., Cichorek, T., Custers, J., Harrison, N., Jaime, M., Lang, M., Ochiai, A. & Steglich, F.. Thermodynamic and transport properties of the one-dimensional S=1/2 antiferromagnet Yb4As3. Physica B 312, 315 (2002).
Gegenwart, P., Aoki, H., Cichorek, T., Custers, J., Jaime, M. Ochiai, A. & Steglich, F. Magnetotransport of the low-carrier density one-dimensional S=1/2 antiferromagnet Yb4As3. Pramana J. Phys. 58, 715 (2002).
Aoki, H., Cichorek, T., Gegenwart, P., Custers, J., Lang, M., Ochiai, A. & Steglich, F. Influence of interchain-coupling effects on the low-T properties of the one-dimensional S=1/2 Heisenberg antiferromagnet Yb4As3. Physica B 312, 367 (2002).
Cichorek, T., Aoki, H., Gegenwart, P., Lang, M., Ochiai, A. & Steglich, F. Low-temperature specific heat of non-charge ordered Yb4(As0.36Sb0.64)3 and (Yb0.87Lu0.13)4As3. Physica B 312, 370 (2002).
Kohgi, M., Iwasa, K., Mignot, J.M., Fak, B., Hiess, A., Gegenwart, P., Lang, M., Ochiai, A., Aoki, H. & Suzuki T. Spin excitations of the one-dimensional S=1/2 Heisenberg antiferromagnet Yb4As3 under magnetic field. Physica B 312, 359 (2002).
Lang, M., Zherlitsyn, S., Wolf, B., Aoki, H., Cichorek, T., Gegenwart, P., Schmidt, B., Steglich, F. & Ochiai, A. Thermodynamic studies of the field-induced gap in the quasi-one-dimensional S=1/2 antiferromagnet Yb4As3. Int. J. Mod. Phys. B 16, 3018 (2002).
Lipp, D., Schneider, M., Gladun, A., Drechsler, S.L., Freudenberger, J., Fuchs, G., Nenkov, K., Muller, K.H., Cichorek, T. & Gegenwart, P. Specific heat and disorder in the mixed state of non-magnetic borocarbides. Europhys. Lett. 58, 435 (2002).
Fuchs, G., Muller, K.H., Freudenberger, J., Nenkov, K., Drechsler, S.L., Shulga, S.V., Lipp, D., Gladun, A., Cichorek, T. & Gegenwart P. Influence of disorder on superconductivity in non-magnetic rare-earth nickel borocarbides. Pramana J. Phys. 58, 791 (2002).
Cichorek, T., Henkie, Z., Wojakowski, A., Pietraszko, A., Gegenwart, P., Lang, M. & Steglich, F. Low-temperature specific heat for off- and near-stoichiometric UAsSe. Solid State Commun. 121, 647 (2002).
2001
Kohgi, M., Iwasa, K., Mignot, J.M., Fak, B., Gegenwart, P., Lang, M., Ochiai, A., Aoki, H. & Suzuki, T. Staggered field effect on the one-dimensional S=1/2 antiferromagnet Yb4As3. Phys. Rev. Lett. 86, 2439 (2001).
Gegenwart, P., Cichorek, T., Custers, J., Lang, M., Aoki, H., Ochiai, A. & Steglich, F. Low-temperature resistivity and susceptibility of the low-carrier density, one-dimensional S-1/2 antiferromagnet Yb4As3. J. Magn. Magn. Mat. 226, 630 (2001).
Schmidt, B., Aoki, H., Cichorek, T., Custers, J., Gegenwart, P., Kohgi, M., Lang, M., Langhammer, C., Ochiai, A., Paschen, S., Steglich, F., Suzuki, T., Thalmeier, P., Wand, B. & Yaresko, A. Low-energy excitations of the semimetallic one-dimensional S=1/2 antiferromagnet Yb4As3. Physica B 300, 121 (2001).
Custers, J., Gegenwart, P., Geibel, C., Steglich, F. Tayama, T., Trovarelli, O. & Harrison, N. Low-temperature magnetic and transport properties of the clean NFL system YbRh2(Si1-xGex)2. Acta Phys. Pol. B 32, 3211 (2001).
Cichorek, T., Henkie, Z., Gegenwart, P., Lang, M., Wojakowski, A., Dischner, M. & Steglich, F. A non-magnetic Kondo effect in UAsSe ferromagnet? J. Magn. Magn. Mat. 226, 189 (2001).
Hossain, Z., Takabatake, T., Geibel, C., Gegenwart, P., Oguro, I. & Steglich, F. Evidence for low-dimensional magnetic behaviour in CePt5Ge3. J. Phys. Condens. Matter 13, 4535 (2001).
2000
Trovarelli, O., Geibel, C., Mederle, S., Langhammer, C., Grosche, F.M., Gegenwart, P., Lang, M., Sparn, G. & Steglich, F. YbRh2Si2: Pronounced non-Fermi-liquid effects above a low-lying magnetic phase transition. Phys. Rev. Lett. 85, 626 (2000).
Trovarelli, O., Geibel, C., Langhammer, C., Mederle, S., Gegenwart, P., Grosche, F.M., Lang, M., Sparn, G. & Steglich, F. Non-Fermi-liquid effects at ambient pressure in the stoichiometric heavy-fermion compound YbRh2Si2. Physica B 281, 372 (2000).
Gegenwart, P., Hinze, P., Geibel, C., Lang, M. & Steglich, F. Incipient superconductivity and NFL behavior in off-stoichiometric Ce1+xNi2+yGe2+z polycrystals. Physica B 281, 5 (2000).
Steglich, F. Sato, N., Tayama, T., Lühmann, T., Langhammer, C., Gegenwart, P., Hinze, P., Geibel, C., Lang, M., Sparn, G. & Assmus, W. Unconventional normal-state properties and superconductivity in heavy-fermion metals. Physica C 341, 691 (2000).
Steglich, F., Gegenwart, P., Geibel, C., Hinze, P., Lang, M., Langhammer, C., Sparn, G. & Trovarelli, O. Non-Fermi-liquid effects in stoichiometric 4f-electron metals at ambient pressure. Physica B 280, 349 (2000).
Steglich, F., Gegenwart, P., Hinze, P., Langhammer, C., Geibel, C., Lang, M. & Sparn, G. On the relationship of magnetism and superconductivity in materials containing partially filled f shells. J. Phys. Soc. Jpn. 69, 71 Suppl. A (2000).
Lang, M., Koppen, M., Gegenwart, P., Cichorek, T., Thalmeier, P., Steglich, F. & Ochiai, A. Evidence for magnons and solitons in the one-dimensional S=1/2 antiferromagnet Yb4As3. Physica B 281, 458 (2000).
Steglich, F., Koppen, M., Gegenwart, P., Cichorek, T., Wand, B., Lang, M., Thalmeier, P., Schmidt, B., Aoki, H. & Ochiai, A. Magnon and soliton excitations in the carrier-poor, one-dimensional S=1/2 antiferromagnet Yb4As3. Acta Phys. Pol. A 97, 91 (2000).
Drechsler, S.L., Rosner, H., Shulga, S.V., Eschrig, H., Freudenberger, J., Fuchs, G., Nenkov, K., Muller, K.H., Lipp, D., Gladun, A., Kreyssig, A., Koepernik, K., Gegenwart, P. & Cichorek, T. Superconductivity in clean and disordered nonmagnetic borocarbides. Physica C 341, 749 (2000).
1999
Gegenwart, P., Kromer, F., Lang, M., Sparn, G., Geibel, C. & Steglich, F. Non-Fermi-liquid effects at ambient pressure in a stoichiometric heavy-fermion compound with very low disorder: CeNi2Ge2. Phys. Rev. Lett. 82, 1293 (1999).
Gegenwart, P., Lang, M., Link, A., Sparn, G., Geibel, C., Steglich, F. & Assmus, W. Evidence for an antiferromagnetic quantum critical point near stoichiometric CeCu2Si2. Physica B 261, 403 (1999).
1998
Gegenwart, P., Langhammer, C., Geibel, C., Helfrich, R., Lang, M., Sparn, G., Steglich, F., Horn, R., Donnevert, L., Link, A. & Assmus, W. Breakup of heavy fermions on the brink of "phase A" in CeCu2Si2. Phys. Rev. Lett. 81, 1501 (1998).
Steglich, F. Geibel, C., Helfrich, R., Kromer, F., Lang, M., Sparn, G., Gegenwart, P., Donnevert, L., Langhammer, C., Link, A., Kim, J.S. & Stewart G.R. CeCu2Si2 and UBe13: New questions - Old answers? J. Phys. Chem. Sol. 59, 2190 (1998).
1997
Trovarelli, O., Weiden, M., Müller-Reisener, R., Gomez-Berisso, M., Gegenwart, P., Deppe, M., Geibel, C., Sereni, J.G. & Steglich, F. Evolution of magnetism and superconductivity in CeCu2(Si1-xGex)2. Phys. Rev. B 56, 678 (1997).
Steglich, F. Gegenwart, P., Helfrich, R., Langhammer, C., Hellmann, P., Donnevert, L., Geibel, C., Lang, M., Sparn, G., Assmus, W., Stewart, G.R. & Ochiai, A. Are heavy-fermion metals Fermi liquids? Z. Phys. B 103, 235 (1997).
Steglich, F. Hellmann, P., Thomas, S., Gegenwart, P., Link, A., Helfrich, R., Sparn, G., Lang, M., Geibel, C. & Assmus, W. "Non-Fermi-liquid" phenomena in heavy-fermion CeCu2Si2 and CeNi2Ge2. Physica B 237-238, 192 (1997).
Gegenwart, P., Lohmann, M., Lang, M., Helfrich, R., Langhammer, C., Köppen, M., Geibel, C., Steglich, F. & Assmus, W. Non-Fermi-liquid behavior in CeCu2Si2 at the disappearance of the presumably magnetically ordered "A-phase". Physica B 230-232, 572 (1997).
1996
Steglich, F. Buschinger, B., Gegenwart, P., Lohmann, M., Helfrich, R., Langhammer, C., Hellmann, P., Donnevert, L., Thomas, S., Link, A., Geibel, C., Lang, M., Sparn, G. & Assmus, W. Quantum critical phenomena in undoped heavy-fermion metals. J. Phys. Condens. Matter 8, 9909 (1996).
Modler, R., Gegenwart, P., Lang, M., Deppe, M., Weiden, M., Lühmann, T., Geibel, C., Steglich, F., Paulsen, C., Tholence, J.L., Sato, N., Komatsubara, T., Onuki, Y., Tachiki, M. & Takahashi S. First-order transition between weak and strong pinning in clean superconductors with enhanced spin susceptibility. Phys. Rev. Lett. 76, 1292 (1996).
Thomas, F., Wand, B., Lühmann, T., Gegenwart, P., Stewart, G.R., Steglich, F., Brison, J.P., Buzdin, A., Glemot, L. & Flouquet, J. Strong coupling effects on the upper critical field of the heavy-fermion superconductor UBe13. J. Low Temp. Phys. 102, 117 (1996).
Gegenwart, P., Deppe, M., Koppen, M., Kromer, F., Lang, M., Modler, R., Weiden, M., Geibel, C., Steglich, F., Fukase, T. & Toyota, N. Anomalous peak effect in heavy-fermion, intermediate-valence and A15 superconductors: Evidence for a Fulde-Ferrell-Larkin-Ovchinnikov state? Ann. Phys. 5, 307 (1996).
Tachiki, M., Takahashi, S., Gegenwart, P., Weiden, M., Lang, M., Geibel, C., Steglich, F., Modler, R., Paulsen, C. & Onuki, Y. Generalized Fulde-Ferrell-Larkin-Ovchinnikov state in heavy-fermion and intermediate-valence systems. Z. Phys. B 100, 369 (1996).
Steglich, F. Gegenwart, P., Geibel, C., Helfrich, R., Hellmann, P., Lang, M., Link, A., Modler, R., Sparn, G., Büttgen, N. & Loidl, A. New observations concerning magnetism and superconductivity in heavy-fermion metals. Physica B 223-224, 1 (1996).
Onuki, Y., Hedo, M., Inada, Y., Settai, R., Sugawara, H., Aoki, Y., Sato, H., Deppe, M., Gegenwart, P., Geibel, C., Lang, M., Lühmann, T., Modler, R., Weiden, M., Steglich, F., Paulsen, C., Tholence, J.L., Sato, N., Komatsubara, T., Tachiki, M. & Takahashi, S. Anomalous pinning in superconductors with strong Pauli paramagnetism. Physica B 223-224, 28 (1996).
Takahashi, S., Tachiki, M., Modler, R., Gegenwart, P., Lang, M. & Steglich, F. Theory of a generalized Fulde-Ferrell-Larkin-Ovchinnikov state in heavy fermion and intermediate-valence superconductors. Physica C 263, 30 (1996).
Steglich, F., Modler, R., Gegenwart, P., Deppe, M., Weiden, M., Lang, M., Geibel, C., Lühmann, T., Paulsen, C., Tholence, J.L., Onuki, Y., Tachiki, M. & Takahashi, S. Experimental evidence for a generalized FFLO state in clean type-II superconductors with short coherence length and enhanced Pauli susceptibility. Physica C 263, 498 (1996).
Huth, M., Reber, S., Heske, C., Schicketanz, P., Hessert, J., Gegenwart, P., & Adrian, H. Growth characteristics of sputter-deposited UPt3 thin films. J. Phys. Condens. Matter 8, 8777 (1996).
Huth, M., Hessert, J., Reber, S., Jourdan, M., Gegenwart, P. & Adrian, H. Strain induced renormalization of transport properties in UPt3 thin films. Czech. J. Phys. 46, 791 (1996).
1995
Steglich, F., Geibel, C., Modler, R., Lang, M., Hellmann, P. & Gegenwart P. Classification of strongly correlated f-electron systems. J. Low Temp. Phys. 99, 267 (1995).
1994
Lühmann, T., Gegenwart, P., Reinders, P.H.P., Geibel, C., Steglich, F., Paulsen, C. & Tholence, J.L. Anomalous pinning near Hc2 in the heavy fermion superconductor UPd2Al3 studied by magnetic measurements. Physica C 235-240, 2433 (1994).
Geibel, C., Buschinger, B., Schank, C., Lühmann, T., Gegenwart, P., Weiden, M. & Steglich, F. Impurities in a superconductor with a highly anisotropic gap: Universal correlation between the residual resistivity and Tc in doped UPd2Al3. Physica C 235-240, 2435 (1994).
Geibel, C., Schank, C., Jährling, F., Buschinger, B., Grauel, A., Lühmann, T., Gegenwart, P., Helfrich, R., Reinders, P.H.P. & Steglich, F. Doping effects on UPd2Al3. Physica B 199-200, 128 (1994).