Thermodynamic investigation of the charge-ordered insulating state of the quasi-one-dimensional organic system (DI-DCNQI)2Ag.
Thermodynamic investigation of the charge-ordered insulating state of the quasi-one-dimensional organic system (DI-DCNQI)2Ag.
复制标题
准一维有机体系 (DI-DCNQI)2Ag 的电荷有序绝缘态的热力学研究。
DOI：
10.1103/physrevlett.88.076402
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发表时间：
2002
影响因子：
8.6
通讯作者：
M. Sorai
中科院分区：
文献类型：
--
作者：
Y. Nakazawa;Mitsuro Seki;Kazuya Saito;K. Hiraki;Toshihiro Takahashi;K. Kanoda;M. Sorai
在0.3-14K温度范围内测量了带电有序有机导体(DI-DCNQI)2AG的热容。在Néel温度(T(N)=5.5K)下没有发现热反常，而是一个T-线性项暗示了带电有序绝缘态中一维特征的自旋激发。对T-线性项和超额熵的分析表明，在高温下，电荷有序态中的电荷涨落影响自旋激发的增长，这似乎是一维电荷有序系统的一个特殊方面。
Heat capacity measurements of a charge-ordered organic conductor (DI-DCNQI)2Ag have been performed in a temperature range between 0.3 and 14 K. We found no thermal anomaly at the Néel temperature ( T(N) = 5.5 K) but instead a T-linear term suggestive of the spin excitations of one-dimensional character in the charge-ordered insulating state. The analysis of the T-linear term and the excess entropy indicates that the charge fluctuations in the charge-ordered state influence the growth of spin excitations at elevated temperatures, which seems to be a peculiar aspect of a 1D charge-ordered system.