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SUMMARY:Orbital Physics in Spinel Oxides - Takuro Katsufuji\, Dept. Phys.\
 , Waseda Univ
DTSTART:20080805T101500Z
DTEND:20080805T111500Z
UID:TALK13028@talks.cam.ac.uk
CONTACT:Michael Sutherland
DESCRIPTION:Orbital degeneracy in the d states of transition-metal oxides 
 gives rise to various intriguing phenomena\, including large magnetic-fiel
 d effect. Such magnetic-field effect is caused by the strong coupling betw
 een orbital and spin degrees of freedom in transition metals\, which arise
 s either from the so-called Kugel-Khomskii interaction (interionic orbital
 -spin coupling) or from single-ion spin-orbit coupling. In my talk\, I sho
 w several intriguing properties\, for example\, magnetic-field-induced str
 uctural phase transition\, “colossal” magnetostriction arising from th
 e magnetic-field-induced alignment of crystalline domains\, and large magn
 etocapacitance\, in spinel oxides (MnV2O4\, FeV2O4\, and Mn3O4)\, and disc
 uss how these properties can be explained by such orbital-spin coupling.
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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