Model for frustrated spin-orbital chains: application to CaV2O4

Details Model for frustrated spin-orbital chains: application to CaV2O4 Model for frustrated spin-orbital chains: application to CaV2O4

2009-07-17

arxiv.org/abs/0907.3006v2

Phys. Rev. B 80, 220405(R) (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, revised discussion of spin-liquid phases

Scientific paper

10.1103/PhysRevB.80.220405

Motivated by recent interest in quasi-one-dimensional compound CaV2O4, we study the ground states of a spin-orbital chain characterized by an Ising-like orbital Hamiltonian and frustrated interactions between S=1 spins. The on-site spin-orbit interaction and Jahn-Teller effect compete with inter-site superexchange leading to a rich phase diagram in which an antiferro-orbital phase is separated from the orbital paramagnet by a continuous Ising transition. Two distinct spin liquids depending on the underlying orbital order are found in the limit of small spin-orbit coupling. In the opposite limit, the zigzag chain behaves as a spin-2 chain with Ising anisotropy. The implications for CaV2O4 are discussed.

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