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TT: Tiefe Temperaturen

TT 14: FV-internes Symposium ”Orbital Physics”

TT 14.1: Invited Talk

Tuesday, March 9, 2004, 14:30–15:00, H18

Lattice instability of frustrated orbital and spin systems — •Maxim Mostovoy — Materials Science Center, University of Groningen, The Netherlands

In materials with strong exchange interactions between electrons occupying degenerate orbitals the cooperative Jahn-Teller effect may be suppressed, as it is often impossible to order orbitals on all pairs of neighboring transition metal ions in a unique optimal way. This frustration may be relieved by several competing mechanisms, e.g., quantum orbital fluctuations or ‘Peierls-like’ lattice distortions. I will discuss similarities and differences between frustrated Jahn-Teller materials and frustrated spin systems, such as antiferromagnets with a pyrocholore and triangular lattice.