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arXiv 0907.3006cond-mat.str-elcond-mat.mtrl-sci
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阻挫自旋轨道链模型:对CaV2O4的应用

Model for frustrated spin-orbital chains: application to CaV2O4

Gia-Wei Chern, Natalia Perkins

摘要:

受准一维化合物CaV_2O_4研究的启发,我们研究了自旋-轨道链的基态,该链具有类伊辛轨道哈密顿量和S=1自旋之间的阻挫相互作用.现场自旋-轨道相互作用和Jahn-Teller效应与现场间的超交换竞争,导致丰富的相图,其中反铁轨道相从轨道顺磁体分离的连续伊辛过渡。两个不同的自旋液体取决于潜在的轨道顺序被发现在小自旋轨道耦合的限制。在相反的极限下,锯齿形链表现为自旋为2的链,具有伊辛各向异性。CaV 2 O 4的影响进行了讨论。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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