Optical investigations of the superconducting energy gap in β"-(BEDT-TTF)2SF5CH2CF2SO3

被引：4
|
作者：
Kaiser, S. [1 ]
Yasin, S. [1 ]
Drichko, N. [1 ]
Dressel, M. [1 ]
Room, T. [2 ]
Huevonen, D. [1 ,2 ]
Nagel, U. [2 ]
Gard, G. L. [3 ]
Schlueter, J. A. [4 ]
机构：
[1] Univ Stuttgart, Inst Phys, D-70550 Stuttgart, Germany
[2] NICPB, EE-12618 Tallinn, Estonia
[3] Portland State Univ, Dept Chem, Portland, OR 97207 USA
[4] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA
来源：
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2012年 / 249卷 / 05期
关键词：
charge order; infrared spectroscopy; organic conductors; superconducting gap; THz spectroscopy; BEDT-TTF; ORGANIC SUPERCONDUCTOR; CONDUCTIVITY; CONDUCTORS; STATE; ORDER;
D O I：
10.1002/pssb.201100526
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The organic salt beta''-(BEDT-TTF)2SF5CH2CF2SO3 is a two-dimensional metal with a quarter-filled conduction band. In the metallic state the optical conductivity evidences interaction of the charge carriers with charge-order fluctuations that become stronger as temperature decreases. In the superconducting phase below Tc approximate to 5K, indications of the superconducting gap with 2 Delta approximate to 12- 1 are observed in the optical spectrum, corresponding to 2 Delta/ kappa Tc-Beta approximate to 3.3. Its temperature and magnetic field dependences are also consistent with predictions by the BCS theory of a weakly coupled superconductor. The conductivity ratio sigma 1(T = 1.75K)/sigma 1(10K) indicates the opening of the superconducting gap in beta''-(BEDT-TTF)2SF5CH2CF2SO3.
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收藏
页码：985 / 990
页数：6
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