Tunneling spectroscopy on κ-(BEDT-TTF)2Cu[N(CN)2]Br using STM

被引：7
|
作者：
Ichimura, K [1 ]
Suzuki, K [1 ]
Nomura, K [1 ]
Kawamoto, A [1 ]
机构：
[1] Hokkaido Univ, Div Phys, Sapporo, Hokkaido 0600810, Japan
来源：
SYNTHETIC METALS | 2003年 / 133卷
关键词：
STM; organic superconductors; paring symmetry;
D O I：
10.1016/S0379-6779(02)00255-2
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report the electron tunneling spectroscopy on kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br using a low temperature STM. In the superconducting state, tunneling spectra show the energy gap structure clearly. The tunneling differential conductance shows linear dependence on energy inside the gap edge. The conductance curve is well fitted by the d-wave calculation with a little broadening. The d-wave gap parameter is obtained as Delta(0) = 2.5-3.5 meV, correspondingly, 2Delta(0)/kT(c) = 5.0-7.1. The pairing symmetry is consistent with that in kappa-(BEDT-TTF)(2)Cu(NCS)(2) as well as the gap parameter. The broad dip structure around the Fermi level is found in tunneling spectra above T-c. The pseudogap structure is observed below 50 K. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：213 / 214
页数：2
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