Nonmetal to metal crossover and ethylene ordering in the organic superconductor κ − ( B E D T − T T F ) 2 Cu [ N ( CN ) 2 ] Br
Nonmetal to metal crossover and ethylene ordering in the organic superconductor κ − ( B E D T − T T F ) 2 Cu [ N ( CN ) 2 ] Br
复制标题
有机超导体中的非金属与金属交叉和乙烯排序 κ − ( B E D T − T T F ) 2 Cu [ N ( CN ) 2 ] Br
DOI：
10.1103/physrevb.59.3841
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发表时间：
1999
影响因子：
3.7
通讯作者：
G. Saito
中科院分区：
文献类型：
--
作者：
M. Tanatar;T. Ishiguro;T. Kondo;G. Saito
用结构弛豫动力学的电阻测量方法研究了有机超导体κ−（B E D T− T T F）2 Cu [N（CN）2] Br及其氘代类似物在等温条件下的相变.在盐中观察到的非金属到金属电阻温度依赖性交叉和在60 K下自旋磁化率温度依赖性的异常被示出是由于由末端乙烯基的排序引起的一阶相变。考虑到乙烯基的两种可能构型及其与阴离子的相互作用，实验确定的转化序列与乙烯有序的微观平均场模型非常一致。
Phase transformations in organic superconductor κ−(B E D T− T T F) 2 Cu [N (CN) 2] Br and its deuterated analog have been studied by resistance measurements of structural relaxation kinetics under isothermal conditions. The nonmetallic to metallic resistance temperature dependence crossover observed in the salts and anomaly of spin susceptibility temperature dependence at 60 K are shown to be due to first-order phase transitions caused by ordering of the terminal ethylene groups. The experimentally determined transformation sequence is in good agreement with the microscopic mean field model of ethylene ordering, taking into account two possible configurations of ethylene groups and their interactions with anions.