Charge disproportionation and inversion symmetry breaking in organic conductor alpha-(BEDT-TTF)(2)RbHg(SCN)(4)

Kawai  T; Kawamoto  A

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Charge disproportionation and inversion symmetry breaking in organic conductor alpha-(BEDT-TTF)(2)RbHg(SCN)(4)

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The quasi-two-dimensional organic conductor alpha-(BEDT-TTF)(2)RbHg(SCN)(4) has been investigated by C-13-NMR using a field parallel to the ac plane of 9.4 T. We observed no enhancement of (T1T)(-1) at 12 K or isotropic reduction of spin susceptibility below 12 K, indicating that spin-density wave formation did not occur at 12 K. Above 100 K, a decrease of spin susceptibility was observed at the C site and a complementary increase was observed at the A and A(') sites, suggesting charge disproportionation due to off-site Coulomb interactions. Below 12 K, the spectrum showed broadening and splitting of peaks. These findings indicate that inversion symmetry breaking in charge-density wave instability occurs at low temperatures.

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《Physical review, B. Condensed matter and materials physics》 |2008年第16期|165119-1-165119-5-0|共5页
作者
Kawai T; Kawamoto A;
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作者单位

[Kawai, T;

Kawamoto, A] Hokkaido Univ, Grad Sch Sci, Dept Phys, Kita Ku, Sapporo, Hokkaido 0600810, Japan;

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正文语种英语
中图分类固体物理学;
关键词
BEDT-TTF; ALPHA-(BEDT-TTF)(2)KHG(SCN)(4); BIS(ETHYLENEDITHIO)TETRATHIAFULVALENE; ALPHA-(BEDT-TTF)(2)MHG(SCN)(4); ALPHA-(BEDT-TTF)2KHG(SCN)4; (BEDT-TTF)2KHG(SCN)4; STATE; PHASE;

Charge disproportionation and inversion symmetry breaking in organic conductor alpha-(BEDT-TTF)(2)RbHg(SCN)(4)

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