XXIInd International Symposium on the Jahn-Teller Effect

Public Lecture (cancelled)

Over half a century of research in oxides

Vortrag von Nobelpreisträger Karl Alex Müller

Update 16.08.2014:
Unfortunately, we have to announce the cancellation of the public lecture.

Für die Entdeckung von Supraleitern in keramischen Materialien erhielt Karl Alex Müller 1987 zusammen mit Georg Bednorz den Nobelpreis für Physik. Müller arbeitete am Zürcher Forschungslabor von IBM und war von 1970 bis 1994 Physikprofessor an der Universität Zürich. Am 18. August ist er an der TU Graz und wird im Rahmen des Jahn-Teller Symposiums in einem Vortrag eine Rückschau auf über 50 Jahre Oxid-Forschung geben.

 

K. A. Müller, Physik Institut, University of Zürich, Switzerland

Abstract:

An attempt will be made to recall some of the highlights of the research in oxides achieved by the author and various collaborators over a period of 58 years. These were the observation of the paramagnetic resonance of transition metal ions of high valency like Fe3+, Fe4+, Fe5+, Co4+, and their photochromic behaviour. Then the detection of Mn4+ in BaTiO3 and the proof for the presence of order-disorder character in these ferroelectric transitions. Then the temperature dependence of the rotational order parameter of the structural phase transitions in LaAlO3 and SrTiO3. Near the transition the observation of critical behaviour compatible with renormalisation group theory, and the presence of a Potts transition line, a critical end point, a Lifshitz point under uniaxial stress in SrTiO3 and CaGdF3. This will be followed by the determination of the stabilisation energy of the Jahn – Teller effect with octahedral oxygen neighbours to various ions; leading over to the concept of Jahn –Teller polarons as quasi particles for the generation of superconductivity, and the experimental observation of Jahn – Teller bipolarons and their stabilisation energy determined in one of the HTS copper oxides.