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 13C
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.
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.
| Original language | English |
|---|---|
| Article number | 121106(R) |
| Number of pages | 5 |
| Journal | Physical Review B |
| Volume | 90 |
| DOIs | |
| Publication status | Published - 22 Sept 2014 |