, Waseda University
[Host: Seunghun Lee ]
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.
Condensed Matter Seminar
Friday, March 13, 2009
Physics Building, Room 313
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