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

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

2005-01-05

arxiv.org/abs/cond-mat/0501063v2

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

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}}.

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