Phase Transition and Spin Dynamics in LiVO 2
Phase Transition and Spin Dynamics in LiVO 2
复制标题
LiVO 2 中的相变和自旋动力学
DOI：
10.1143/jpsj.60.2550
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发表时间：
1991
影响因子：
1.7
通讯作者：
H. Nagasawa
中科院分区：
文献类型：
--
作者：
M. Onoda;T. Naka;H. Nagasawa
通过磁化率和核磁共振测量研究了三角形晶格化合物LiVO2的相变和自旋动力学。结果表明，在非磁-磁转变温度(加热时约500K，冷却时约440K)以下，V离子的局域对称性发生扭曲，从而引起51V核的四极效应和奈特位移各向异性。用自旋数S=1的局域自旋模型解释了V离子在跃迁以上的电子态和自旋动力学，并提出从跃迁到约140K的动力学可以用V3+离子三聚引起的基态可能是自旋单态的热激发自旋来描述。
The phase transition and the spin dynamics in a triangular lattice compound LiVO 2 have been studied through magnetic susceptibility and NMR measurements. It has been found that the quadrupole effect and the anisotropy of the Knight shift of the 51 V nuclei are appreciably induced due to the distortion of the local symmetry at the V ions below the nonmagnetic-magnetic transition temperatures which are about 500 K on heating and 440 K on cooling. The electronic state and the spin dynamics of V ions above the transition have been explained by the localized spin model with the spin number S =1. It has also been suggested that the dynamics from the transition to about 140 K may be described by the thermally excited spin whose ground state is possibly spin-singlet due to the trimerization of V 3+ ions.