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Charge disproportionation with lattice distortion ofα-(BEDT−TTF)2RbHg(SCN)4observed by13C-NMR

Authors :
Atsushi Kawamoto
Yoshihiko Ihara
Kazuki Noda
Source :
Physical Review B. 87
Publication Year :
2013
Publisher :
American Physical Society (APS), 2013.

Abstract

To explore the connection between $\ensuremath{\alpha}$-(BEDT$\ensuremath{-}$TTF)${}_{2}$I${}_{3}$ and $\ensuremath{\alpha}$-(BEDT$\ensuremath{-}$TTF)${}_{2}$$M$Hg(SCN)${}_{4}$ ($M=\text{K}$, Rb, Tl and NH${}_{4}$) and to resolve the difference between band picture and charge fluctuation of $\ensuremath{\alpha}$-(BEDT$\ensuremath{-}$TTF)${}_{2}$$M$Hg(SCN)${}_{4}$, we utilized ${}^{13}$C-NMR to examine $\ensuremath{\alpha}$-(BEDT$\ensuremath{-}$TTF)${}_{2}$RbHg(SCN)${}_{4}$ under the conditions with a large hyperfine coupling constant at each site. The temperature dependence of site susceptibility showed the development of spin disproportionation as observed in $\ensuremath{\alpha}$-(BEDT$\ensuremath{-}$TTF)${}_{2}$I${}_{3}$. We found that the linewidth of the A site only increased as temperature decreased from 200 to 100 K, a change associated with the development of lattice modulation. These findings indicate that density-wave modulation occurs during charge disproportionation instability.

Details

ISSN :
1550235X and 10980121
Volume :
87
Database :
OpenAIRE
Journal :
Physical Review B
Accession number :
edsair.doi...........45f56f7bc4eb6021367787efad6a08b5
Full Text :
https://doi.org/10.1103/physrevb.87.085105