Redistribution of electronic charges in spin-Peierls state in (TMTTF)2AsF6 observed by 13C NMR

Abstract

We report ^{13}C NMR spectra and nuclear spin lattice relaxation rate 1/T_1 for a quasi-one-dimensional quarter-filled organic material (TMTTF)_{2}AsF_{6}, which undergoes charge ordering (T_{CO} = 102 K) and spin-Peierls phase transitions (T_{SP} = 14 K). The ratio of two 1/T_1 for the charge accepting and donating TMTTF sites which grows from T_{CO} finally saturates in approaching T_{SP}, indicating one spin correlation function even in the charge ordered state. Below T_{SP}, however, the doubly split NMR lines from inequivalently charged molecules merge into one line, originated from the variation in charge densities. This shows that a rearrangement of the charge configuration occurs at T_{SP}.

To appear in Journal of the Physical Society of Japan, Vol. 75 No. 1

References in corpus (4)

• A `checkerboard' electronic crystal state in lightly hole-doped Ca_{2-x}Na_{x}CuO_{2}Cl_{2}
• Competition and coexistence of bond and charge orders in (TMTTF)2AsF6
• Coexistence of Charge Order and Spin-Peierls Lattice Distortion in One-Dimensional Organic Conductors
• Charge disproportionation in (TMTTF)2SCN observed by 13C NMR

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• NMR Evidences for the coupling between conduction electrons and molecular degrees of freedom in the exotic member of the Bechgaard salt, (TMTSF)2FSO3