Spin-Peierls transition in N-methyl-N-ethyl-morpholinium-ditetracyanoquinodimethanide [MEM-(TCNQ) 2 ]
Spin-Peierls transition in N-methyl-N-ethyl-morpholinium-ditetracyanoquinodimethanide [MEM-(TCNQ) 2 ]
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N-甲基-N-乙基-吗啉鎓-二四氰基醌二甲烷中的自旋-佩尔尔斯转变 [MEM-(TCNQ) 2 ]
DOI：
10.1103/physrevb.19.4723
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发表时间：
1979
影响因子：
3.7
通讯作者：
J. Roos
中科院分区：
文献类型：
--
作者：
S. Huizinga;J. Kommandeur;G. Sawatzky;B. Thole;K. Kopinga;W. D. Jonge;J. Roos
本文用自旋-佩尔斯跃迁理论重新解释了MEM-(TCNQ)2的磁化率数据，给出并讨论了其比热数据。我们发现这些数据可以用平均场自旋-佩尔斯跃迁理论很好地描述，这表明在低温下TCNQ链应该是四聚的。在转变温度以上的磁化率表现为一维海森堡反铁磁体。讨论了这种行为对现场库仑相互作用相对大小的影响。
In this paper we reinterpret the magnetic-susceptibility data and present and discuss specificheat data on MEM-(TCNQ)2 in terms of a spin-Peierls transition theory. We find that the data can be described reasonably well by a mean-field spin-Peierls transition theory which suggests that at low temperatures the TCNQ chain should be tetramerized. The magnetic susceptibility above the transition temperature is shown to behave like a one-dimensional Heisenberg antiferromagnet. The consequences of this behavior on the relative magnitude of the on-site Coulomb interaction are discussed.