Fakultät für Physik

The research interest can be divided into two fields: disordered systems and magnetic thin films.

The glass group is working with metallic glasses and polymers which can be prepared in bulk form or as thin films. In contrast to crystalline samples these systems do not show a long range order in the atomic structure but fascinating
properties like a glass transition, unusual mechanical properties and a varition in their frequency dependent shear modulus.In the actual focus of interest is the relaxation behaviour measured by mechanical spectroscopy starting at quasistatic measurements up to ultrasound experiments. Here we focus on so called alha- and beta- relaxations and their microscopic origins together with simulation experiments (S.G. Mayr's group) and strain rate dependent experiments (in ooperation with the Caltech group of W.L. Johnson).

Oxidic thin films of manganites show a metal insulator transition accompanied by the occurrence of magnetism below the transition in the metallic phase. The electric conductivity strongly depends on an external magnetic field leading to the so called ‘colossal magneto resistance effect’ . In our group thin film samples are prepared (MAD technology and sputtering) and characterized by different techniques like X-ray diffraction, transport measurements, SQUID magnetometer and scanning tunnelling microscopy/spectroscopy. In the moment we are interested in the polaronic properties and local changes of the orbital system close to the CMR transition. Using local probes we analyse the electronic density with highest resolution to characterise the exciting properties. In cooperation with groups in Aachen, Konstanz and Augsburg we also looking into current induced changes of the MIT which might be useful for applications as storage materials (Siemens).