Identification and Characterization of Two Energy Gaps in Superconducting MgB2 by Specific-Heat Measurements

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dc.creatorFisher, R. A.
dc.creatorBouquet, F.
dc.creatorPhillips, N. E.
dc.creatorHinks, D. G.
dc.creatorJorgensen, J. D.
dc.date2001-07-04
dc.date.accessioned2026-07-07T02:42:02Z
dc.date.available2026-07-07T02:42:02Z
dc.descriptionThis paper reports specific-heat measurements on superconducting MgB2 in magnetic fields to 9 T. In zero magnetic field the data can be fitted to a two-gap model, which is a generalization of a semi-empirical model for strong-coupled, single-gap superconductors (the alpha-model), to within the precision of the data. Both gaps close at Tc, with one gap larger and one smaller than the BCS weak-coupling-limit. (The two gaps have a ratio ~ 4:1.) Each gap accounts for ~ 50% of the normal electron density of states. The parameters characterizing the fits agree well with those from recent spectroscopic measurements and theory. In magnetic fields the superconductong anomaly is broadened as expected for an anisotropic, randomly-oriented superconductor.
dc.description10 pages in PDF format containing text plus figures in 1 unzipped file. Replacement was to make changes to the abstract
dc.identifierhttps://arxiv.org/abs/cond-mat/0107072
dc.identifierhttp://arxiv.org/abs/cond-mat/0107072
dc.identifier"Studies of High Temperature Superconductors" Vol 38, Ed. A. V. Narlikar, Nova Science, NY
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/17977
dc.subjectSuperconductivity
dc.titleIdentification and Characterization of Two Energy Gaps in Superconducting MgB2 by Specific-Heat Measurements
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