Charge disproportionation and dynamics in θ-(BEDT-TTF)2CsZn(SCN)4

被引：20
|
作者：
Chiba, R. [1 ]
Hiraki, K. [1 ]
Takahashi, T. [1 ]
Yamamoto, H. M. [2 ]
Nakamura, T. [3 ]
机构：
[1] Gakushuin Univ, Dept Phys, Tokyo 1718588, Japan
[2] RIKEN, Wako, Saitama 3510198, Japan
[3] Natl Inst Nat Sci, Inst Mol Sci, Okazaki, Aichi 4448585, Japan
来源：
PHYSICAL REVIEW B | 2008年 / 77卷 / 11期
关键词：
D O I：
10.1103/PhysRevB.77.115113
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The electronic state of two-dimensional organic conductor, theta-(BEDT-TTF)(2)CsZn(SCN)4, has been investigated by means of C-13-NMR line shape analyses on selectively C-13-enriched single crystal sample. Strong charge disproportionation was found to develop in the "metallic" state well above metal-insulator transition temperature of similar to 20 K. The charge disproportionation becomes almost static below similar to 140 K, forming a shor-trange charge ordering, but no long-range ordering is stabilized at low temperatures down to 5 K. About half of the molecular sites become nonmagnetic, while the other half carries finite magnetic moments. Charge disproportionation becomes very much reduced at least at the nonmagnetic molecular sites, implying that charge rearrangement occurs at similar to 20 K.
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页数：10
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