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Condensed Matter Seminars

ics Condensed Matter
Friday, March 13, 2009
11:00 AM
Physics Building, Room 313
Note special date.
Takuro Katsufuji [Host: Seunghun Lee ]
Waseda University
"Orbital degrees of freedom on triangle-based lattice"
ABSTRACT:
Orbital degrees of freedom arising from the degeneracy of d states give rise to intriguing behaviors in various transition-metal oxides. For example, spinel vanadates (ZnV2O4, MnV2O4, FeV2O4, AlV2O4), where two d electrons occupy the triply degenerate t2g orbitals, exhibit various types of orbital ordering. In this talk, orbital ordering of V ions on triangle-based lattice (SrVxGa12-xO19, BaV10O15) is discussed. In these compounds, V trimers in a spin-singlet state are formed, but spins on a part of the V ions survive, which are frustrated or ordered at low temperatures. Such a spontaneous segregation into spin-singlet clusters and magnetic ions could be a characteristic of the spin-orbital system on triangle-based lattice.

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