Superconducting gap in MgB2:: Electronic Raman scattering measurements of single crystals -: art. no. 087001

被引：142
|
作者：
Quilty, JW [1 ]
Lee, S [1 ]
Yamamoto, A [1 ]
Tajima, S [1 ]
机构：
[1] Int Superconduct Technol Ctr, Superconduct Res Lab, Koto Ku, Tokyo 1350062, Japan
来源：
PHYSICAL REVIEW LETTERS | 2002年 / 88卷 / 08期
关键词：
D O I：
10.1103/PhysRevLett.88.087001
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Polarization-resolved Raman scattering measurements were performed on MgB2 single crystals to determine the magnitude, symmetry, and temperature dependence of the superconducting gap. A single sharp peak due to Cooper pair breaking appears in the electronic continuum below T-c, reaching a maximum Raman shift of 105 +/- 1 cm(-1) [2Delta (0)/k(B)T(c) = 3.96 +/- 0.09] and showing up to 5 cm(-1) anisotropy between polarized and depolarized spectra. The temperature dependence of 2Delta follows that predicted from BCS theory, while the anisotropy decreases with decreasing temperature. It is concluded that the Raman results are consistent with a slightly anisotropic s-wave gap in a conventional BCS superconductor.
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页数：4
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