Effect of disorder on the charge-carrier dynamics in κ-(D8-ET)2Cu[N(CN)2]Br

被引：1
|
作者：
Brandenburg, Jens [1 ]
Mueller, Jens [1 ]
Schlueter, John A. [2 ]
机构：
[1] Goethe Univ Frankfurt, Inst Phys, D-60438 Frankfurt, Germany
[2] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA
来源：
PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 9, NO 5 | 2012年 / 9卷 / 05期
关键词：
organic metals; Mott transition; fluctuation spectroscopy; resistance noise; disorder; SUPERCONDUCTOR; TRANSITION; BEHAVIOR;
D O I：
10.1002/pssc.201100629
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
We have applied resistance fluctuation spectroscopy to study the intrinsic low-frequency dynamics of the charge carriers in the system kappa-(D-8-ET)(2)Cu[N(CN)(2)]Br for two different cooling rates. A strong increase of both the resistance and the noise level is observed below the thermodynamic glass-transition temperature T-g. Surprisingly, the data of the normalized spectral weight <(delta R)(2)>/R-2 fall on top of each other for both cooling rates except for temperatures near the Mott critical point (T-0 similar or equal to 35 K) and below 28K. The suppression of the peak in <(delta R)(2)>/R-2 associated with the Mott transition suggests that disorder is an additional parameter in the generalized phase diagram. The enhanced noise level below 28K might be explained by a disorder-induced staggered magnetic moment in the metallic state close to the antiferromagnetic Mott insulator. (C) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
引用
收藏
页码：1171 / 1173
页数：3
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