2024-03-29T06:50:00Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/576502022-11-17T02:08:08Zhdl_2115_20039hdl_2115_116C-13 NMR study of the charge-ordered state near the superconducting transition in the organic superconductor β"-(BEDT-TTF)(4)[(H3O)Ga(C2O4)(3)]⋅C6H5NO2Ihara, Y.Jeong, M.Mayaffre, H.Berthier, C.Horvatic, M.Seki, H.Kawamoto, A.420The charge-ordered state in a quasi-two-dimensional organic superconductor β"-(BEDT-TTF)(4)[(H3O)Ga(C2O4) 3]⋅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.American Physical SocietyJournal Articleapplication/pdfhttp://hdl.handle.net/2115/57650https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/57650/1/PhysRevB_90_121106-.pdf1098-01211550-235XPhysical review B90121211062014-09-22enginfo:doi/10.1103/PhysRevB.90.121106©2014 American Physical Societypublisher