Spectroscopic evidence for anisotropic s-wave pairing symmetry in MgB2 -: art. no. 012505

被引：61
|
作者：
Seneor, P [1 ]
Chen, CT
Yeh, NC
Vasquez, RP
Bell, LD
Jung, CU
Park, MS
Kim, HJ
Kang, WN
Lee, SI
机构：
[1] CALTECH, Dept Phys, Pasadena, CA 91125 USA
[2] CALTECH, Jet Prop Lab, Ctr Space Microelect Technol, Pasadena, CA 91109 USA
[3] Pohang Univ Sci & Technol, Natl Creat Res Initiat Ctr Superconduct, Pohang 790784, South Korea
[4] Pohang Univ Sci & Technol, Dept Phys, Pohang 790784, South Korea
来源：
PHYSICAL REVIEW B | 2002年 / 65卷 / 01期
关键词：
D O I：
10.1103/PhysRevB.65.012505
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Scanning tunneling spectroscopy of superconducting MgB2 (T-c = 39 K) were studied on high-density pellets and c-axis oriented films. The sample surfaces were chemically etched to remove surface carbonated, and hydroxides, and the data were compared with calculated spectra for all symmetry-allowed pairing channels. The pairing potential (Delta(k)) is best described by an anisotropic s-wave pairing model, with Delta(k) = Delta(xy) sin(2)theta(k) +Delta(z) cos(2)theta(k), where theta(k) is the angle relative to the crystalline c-axis, Delta(z) similar to 8.0 meV, and Delta(xy) similar to 5.0 meV.
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页码：1 / 4
页数：4
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