Electronic Properties of a TMTTF-Family Salt, (TMTTF)2TaF6: New Member Located on the Modified Generalized Phase-Diagram
Electronic Properties of a TMTTF-Family Salt, (TMTTF)2TaF6: New Member Located on the Modified Generalized Phase-Diagram
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DOI：
10.1143/jpsj.78.104717
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发表时间：
2009-10-01
影响因子：
1.7
通讯作者：
Nakamura, Toshikazu
中科院分区：
文献类型：
--
作者：
Iwase, Fumitatsu;Sugiura, Koichi;Nakamura, Toshikazu
合成了一种新的TMTTF（四甲基四硫杂富瓦烯）族盐（TMTTF）（2）TaF_6，它是TMTTF族盐中具有最大八面体（O-h）对称性的抗衡阴离子。为了研究（TMTTF）（2）TaF 6的电子状态，进行了X射线、静态磁化率、电子自旋共振（ESR）和核磁共振（NMR）测量。（TMTTF）（2）TaF 6的晶胞体积大于（TMTTF）（2）MF 6（M = P、As和Sb）的晶胞体积。（2）TaF_6在具有O-h对称反离子的TMTTF盐中具有最高的电荷有序相变温度（δ（CO）= 175 K）。这些事实表明（TMTTF）（2）TaF_6在TMTCF族盐的广义相图中位于最负的一侧。（TMTTF）（2）TaF_6在9 K附近发生反铁磁转变。原来相图需要修改。
A new TMTTF (tetramethyl-tetrathia-fulvalene)-family salt, (TMTTF)(2)TaF6, which has the largest octahedral (O-h) symmetry counter anion among the various salts in the TMTTF family, was prepared. X-ray, static magnetic susceptibility, electron spin resonance (ESR) and nuclear magnetic resonance (NMR) measurements were carried out in order to investigate the electronic state of (TMTTF)(2)TaF6. The unit-cell volume of (TMTTF)(2)TaF6 is larger than that of (TMTTF)(2)MF6 (M = P, As, and Sb). (TMTTF)(2)TaF6 shows the highest charge-ordering phase transition temperature (7(CO) similar to 175 K) among TMTTF salts with the O-h-symmetry Counter anion. These facts indicate that (TMTTF)(2)TaF6 is located on the most negative side in the generalized phase-diagram for TMTCF family salts. (TMTTF)(2)TaF6 undergoes an anti ferromagnetic transition around 9 K. It turned out the phase diagram needs to be modified.