尽管 (R 1 ,R 3 -DCNQI) 2 Cu 盐 (I) 是同构的(空间群 I4 1 /a),但它们在冷却时表现不同:M 族盐在最低温度下仍保持金属状态,而 MI 族盐显示在温度 T M-1 =160-230 K 时向半导体的相变。关于甲基的空间要求,1a (CH 3 /CH 3 /H 2 ) 预计属于 MI 组,但它仍然存在金属甚至在 0.4 K (σ=500 000 S cm -1 )
Preparation and physical properties of an alloyed (DMe-DCNQI)2Cu with fully deuterated DMe-DCNQI (DMe-DCNQI = 2,5-dimethyl- N,N′-dicyanoquinonediimine)
Abstract Preparation, electrical resistivity, static magnetic susceptibility, and low-temperature X-ray study of the alloyed molecular conductor [(DMe-DCNQI-h 8 ) 1− x (DMe-DCNQI-d 8 ) x ] 2 Cu are described. The very low-pressure (P ca. 500 bar) region in the pressure-temperature phase diagram for (DMe-DCNQI) 2 Cu obtained by the helium gas pressure technique could be reproduced under ambient pressure
摘要 描述了合金化分子导体 [(DMe-DCNQI-h 8 ) 1− x (DMe-DCNQI-d 8 ) x ] 2 Cu 的制备、电阻率、静磁化率和低温 X 射线研究。通过氦气压力技术获得的 (DMe-DCNQI) 2 Cu 的压力-温度相图中的极低压(P 约 500 bar)区域可以通过与 DMe-DCNQI-d 合金化在环境压力下重现8 . 根据强相关性图片讨论结果。