Physics – Condensed Matter – Materials Science
Scientific paper
2012-02-06
Physics
Condensed Matter
Materials Science
17pages, 6figures
Scientific paper
We report a $^{13}$C-NMR study on the organic conductor $\theta$-(BEDT-TTF)$_{2}$I$_{3}$ [BEDT-TTF: bisethylenedithio-tetrathiafulvalene] at ambient pressure. The lattice symmetry is consistent with the pseudo-orthorhombic structure by the orientation dependence of the NMR spectra, in which all molecules in the unit cell are crystallographically equivalent. There is no signature of charge disproportionation as observed in most of the $\theta$-type BEDT-TTF salts. The analysis of NMR Knight shift, $K$, and the nuclear spin-lattice relaxation rate, $1/T_{1}$, revealed the degree of electron correlation, evaluated by the Korringa ratio ($\varpropto 1/T_{1}TK^{2}$), is in an intermediate regime. However, NMR relaxation rate is enhanced above 200 K, which is a possible indication that the system enters into a quantum critical regime of charge-order fluctuations as suggested theoretically.
Hirata Michihiro
Kanoda Kazushi
Miyagawa Kazuya
Tamura Masafumi
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