13C NMR study of the charge-ordered state near the superconducting transition in the organic superconductor ß"-(BEDT-TTF)4[(H3O)Ga(C2O4)3]•C6H5NO2

被引：14
|
作者：
Ihara, Y. [1 ]
Jeong, M. [2 ,3 ]
Mayaffre, H. [2 ,3 ]
Berthier, C. [2 ,3 ]
Horvatic, M. [2 ,3 ]
Seki, H. [1 ]
Kawamoto, A. [1 ]
机构：
[1] Hokkaido Univ, Grad Sch Sci, Dept Phys, Sapporo, Hokkaido 0600810, Japan
[2] UPS, UJF, LNCMI CNRS UPR3228, Lab Natl Champs Magnet Intenses, F-38042 Grenoble 9, France
[3] INSA, F-38042 Grenoble 9, France
来源：
PHYSICAL REVIEW B | 2014年 / 90卷 / 12期
关键词：
CONDUCTORS; PRESSURE; INSTABILITIES; NBSE3;
D O I：
10.1103/PhysRevB.90.121106
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The charge-ordered state in a quasi-two-dimensional organic superconductor ss"-(BEDT-TTF)(4)[(H3O)Ga(C2O4) 3]center dot C6H5NO2 has been investigated using C-13 NMR spectroscopy in a high magnetic field. Enhanced resolution of the high-field spectrum allows us to estimate the site charges in the low-temperature charge-ordered state below 8.5 K. The observed strong increase in the charge imbalance suggests that superconductivity appears on the electronic state with a strong charge modulation. From the NMR intensity ratio of signals from the charge-rich and charge-poor sites, we discuss a possible charge pattern with threefold modulation, which could be stabilized by the effects of electron-electron correlations.
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页数：5
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