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Spectroscopic evidence for anisotropic s-wave pairing symmetry in MgB2

Seneor, P. and Chen, C.-T. and Yeh, N.-C. and Vasquez, R. P. and Bell, L. D. and Jung, C. U. and Park, Min-Seok and Kim, Heon-Jung and Kang, W. N. and Lee, Sung-Ik (2002) Spectroscopic evidence for anisotropic s-wave pairing symmetry in MgB2. Physical Review B, 65 (1). Art. No. 012505. ISSN 1098-0121. http://resolver.caltech.edu/CaltechAUTHORS:SENprb01

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Abstract

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.


Item Type:Article
Additional Information:©2001 The American Physical Society. Received 10 September 2001; published 29 November 2001. The research at Caltech was supported by NSF Grant #DMR-0103045 and the Caltech President’s Fund. Part of the work described in this paper was performed by the Center for Space Microelectronics Technology, Jet Propulsion Laboratory, and was sponsored by NASA. The work at Pohang University was supported by the Ministry of Science and Technology of Korea through the Creative Research Initiative Program. http://arxiv.org/abs/cond-mat/0104285
Subject Keywords:superconductors
Record Number:CaltechAUTHORS:SENprb01
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:SENprb01
Alternative URL:http://dx.doi.org/10.1103/PhysRevB.65.012505
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:882
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:01 Nov 2005
Last Modified:26 Dec 2012 08:41

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