TY - JOUR
T1 - Model for frustrated spin-orbital chains as applied to CaV2 O4
AU - Chern, Gia Wei
AU - Perkins, Natalia
PY - 2009/12/10
Y1 - 2009/12/10
N2 - Motivated by recent interest in quasi-one-dimensional compound CaV2 O4, 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 the Jahn-Teller effect compete with intersite 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 CaV2 O4 are discussed.
AB - Motivated by recent interest in quasi-one-dimensional compound CaV2 O4, 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 the Jahn-Teller effect compete with intersite 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 CaV2 O4 are discussed.
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U2 - 10.1103/PhysRevB.80.220405
DO - 10.1103/PhysRevB.80.220405
M3 - Article
AN - SCOPUS:77954726231
VL - 80
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 1098-0121
IS - 22
M1 - 220405
ER -