Spin-Peierls Transition in Alkali-TCNQ Salts
Spin-Peierls Transition in Alkali-TCNQ Salts
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碱-TCNQ 盐中的自旋-佩尔斯转变
DOI：
10.1143/jpsj.47.1752
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发表时间：
1979
影响因子：
1.7
通讯作者：
K. Motizuki
中科院分区：
文献类型：
--
作者：
Y. Takaoka;K. Motizuki
从定域电子系统的角度研究了碱-TCNQ盐的二聚化相变。采用一维反铁磁海森堡模型。在该模型中，自旋-晶格相互作用是由晶格扭曲引起的交换相互作用的调制引起的。在Hartree-Fock和绝热近似下，位移、比热和磁化率作为温度的函数被计算出来。用这一理论解释了在碱-TCNQ盐中观察到的一级相变。最后，研究了伊辛链的二聚化相变，讨论了交换作用的各向异性对结构相变的影响。
The dimerization phase transition of alkali-TCNQ salts has been studied from the standpoint of the localized electron system. The one-dimensional antiferro-magnetic Heisenberg model is used. In this model the spin-lattice interaction is caused by the modulation of the exchange interaction due to lattice distortion. Within the Hartree-Fock and adiabatic approximations, the displacement, specific heat, and susceptibility are calculated as functions of temperature. The first order phase transition observed in alkali-TCNQ salts is explained by this theory. Finally, the dimerization phase transition of the Ising chain is studied to discuss the effect of the anisotropy of the exchange interaction on the structural phase transition.