C13 NMR study of the charge-ordered state near the superconducting transition in the organic superconductor β′′−(BEDT-TTF)4[(H3O)Ga(C2O4)3]·C6H5NO2
Y. Ihara, M. Jeong, H. Mayaffre, C. Berthier, M. Horvatić, H. Seki, A. Kawamoto
DOI 10.1103/PhysRevB.90.121106 · Physical Review B
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Abstract
The charge-ordered state in a quasi-two-dimensional organic superconductor β′′−(BEDT-TTF)4[(H3O)Ga(C2O4)3]·C6H5NO2 has been investigated using C13 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (BEDT-TTF)4[(H3O)Ga(C2O4)3]·C6H5NO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure not reported | unknown |
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