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Physical Properties and Crystal Structure at Low Temperature of the Molecular Conductor (DMe-DCNQI)2Cu System

机译:分子导体(DMe-DCNQI)2Cu系统的低温物理性质和晶体结构

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摘要

The mixed-valence Cu salt of DMe-DCNQIProvides unique physical properties due to the interaction betweenthe one-dimensional (1D) organic p? band the d-orbital of Cu ion.This system is metallic down to very low temperature at ambientpressure in spite of the 1D column structure, whereas the systemexhibits a sharp metal-insulator (M-I) transition accompanied by athreefold superstructure under pressure. Reentrant behavior (M-I-M transition) is observed in the boundary pressure region. Theselective dueteration of (DMe-DCNQI)2Cu has enabled to controlthe chemical pressure. Application of this technique produces thePeff-T phase diagram of this system under ambient pressure. Theeffect of (chemical) pressure on these transitions in the system isgenerally understood from the change in charge transfer amountfrom metal ions to DCNQI molecules by low temperature crystalstructure analysis and a doping method.
机译:DMe-DCNQIP的混合价铜盐由于一维(1D)有机化合物之间的相互作用而具有独特的物理性质。尽管具有一维柱状结构,但该系统在环境压力下仍可在低至室温下将金属离子化成d轨道,而该系统却表现出尖锐的金属-绝缘体(M-I)转变,并在压力下具有三重上层结构。在边界压力区域观察到折返行为(M-I-M转变)。 (DMe-DCNQI)2Cu的选择性酯交换能够控制化学压力。该技术的应用产生了该系统在环境压力下的Peff-T相图。通过低温晶体结构分析和掺杂方法,从金属离子到DCNQI分子的电荷转移量的变化,通常可以理解(化学)压力对系统中这些跃迁的影响。

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