Probing the superconducting energy gap from infrared spectroscopy on a Ba0.6K0.4Fe2As2 single crystal with Tc=37 K

被引：140

作者：

Li, G. ^{[1
]}

Hu, W. Z. ^{[1
]}

Dong, J. ^{[1
]}

Li, Z. ^{[1
]}

Zheng, P. ^{[1
]}

Chen, G. F. ^{[1
]}

Luo, J. L. ^{[1
]}

Wang, N. L. ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 10期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.101.107004

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We performed optical spectroscopy measurement on a superconducting Ba0.6K0.4Fe2As2 single crystal with T-c = 37 K. Formation of the superconducting energy gaps in the far-infrared reflectance spectra below T-c is clearly observed. A flat and close to unity reflectance is observed roughly below 150 cm(-1) for T < T-c, following an s-wave pairing line shape. A more rapid decrease occurs near 200 cm(-1), leading to a peak in the ratio of the reflectance at T << T-c over that for T >= T-c. We determined the absolute value of the penetration depth at 10 K as lambda similar or equal to 2000 +/- 80 angstrom. A spectral weight analysis shows that the Ferrell-Glover-Tinkham sum rule is satisfied at low energy scale, less than 6 Delta.

引用

页数：4

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