Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charge disproportionation in (TMTTF)2SCN observed by 13C NMR   The results of 13C NMR spectra and nuclear spin-lattice relaxation rate 1/T_1
for the quasi-one-dimensional quarter-filled organic material (TMTTF)2SCN are
presented. A new inhomogeneous line appears below the anion ordering
temperature (T_AO), below which the intensity of the distinct line owing to the
inner carbon site from the inversion center is halved. This indicates that the
charge transfer (disproportionation) occurs from one inner carbon site to the
other inner site exclusively within one unit cell triggered by anion ordering.
The 1/T_1 for the charge-donating inner site shows activated temperature
dependence below T_AO, although 1/T_1 for the outer carbon decreases much more
moderately in lowering temperature as has been discussed in weakly interacting
one dimensional conductors. Our observation of the local gap for the spin
excitation generated by anion ordering is consistent with the simple model
assuming only the electrostatic interaction between the inner carbon sites and
ordered anions, which is known to be much closer to the inner sites than to the
outer sites. Nevertheless, we reveal that only the electrostatic interaction
between the anions and molecules is insufficient to reproduce the observed
divergence of the frequency shift and the linewidth of the inhomogeneous line
stemming from the charge-accepting inner site at a much lower temperature than
T_AO.

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The categories of this paper are: math-ph
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph