Microscopic modulation of local density of states in superconducting alpha-(BEDT-TTF)2NH4Hg(SCN)4 studied by site-selective 13C-NMR spectroscopy
Microscopic modulation of local density of states in superconducting alpha-(BEDT-TTF)2NH4Hg(SCN)4 studied by site-selective 13C-NMR spectroscopy
复制标题
通过位点选择性 13C-NMR 光谱研究超导 α-(BEDT-TTF)2NH4Hg(SCN)4 局部态密度的微观调制
DOI：
10.1103/physrevb.90.041107
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发表时间：
2014
影响因子：
3.7
通讯作者：
and A. Kawamoto
中科院分区：
文献类型：
--
作者：
Y. Ihara;K. Noda;and A. Kawamoto
利用位置选择核磁共振波谱法分别研究了有机超导体中每个晶体独立分子位点上的局部电子态。三个分子位置的态密度（DOS）表现出独立的温度变化，这是由远距离库仑相互作用引起的。将目前的结果与非超导对应物的结果进行比较，我们发现三个独立分子位点中两个的均匀DOS对于诱导超导性至关重要。以位相关的DOS为参数，构造了具有远距离库仑相互作用的超导体的相图，即一类BEDT-TTF族，并总结了电荷不稳定性与超导性的竞争。
The local electronic state at every crystallographically independent molecular site was separately investigated in the organic superconductorusing site-selective-NMR spectroscopy. The density of states (DOS) at three molecular sites shows independent temperature variation, which is caused by the long-range Coulomb interaction. Comparing the present results with those for a nonsuperconducting counterpart, we found that the uniform DOS at two of three independent molecular sites is crucial to induce superconductivity. Taking the site-dependent DOS as a parameter, we constructed a phase diagram for a superconductor with long-range Coulomb interaction, an-type BEDT-TTF family, and summarized the competition between charge instability and superconductivity.