MgB2 Energy Gap Determination by Scanning Tunneling Spectroscopy

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dc.creatorHeitmann, T. W.
dc.creatorBu, S. D.
dc.creatorKim, D. M.
dc.creatorChoi, J. H.
dc.creatorGiencke, J.
dc.creatorEom, C. B.
dc.creatorRegan, K. A.
dc.creatorRogado, N.
dc.creatorHayward, M. A.
dc.creatorHe, T.
dc.creatorSlusky, J. S.
dc.creatorKhalifah, P.
dc.creatorHaas, M.
dc.creatorCava, R. J.
dc.creatorLarbalestier, D. C
dc.creatorRzchowski, M. S.
dc.date2002-12-09
dc.date2003-09-29
dc.date.accessioned2026-07-07T02:48:37Z
dc.date.available2026-07-07T02:48:37Z
dc.descriptionWe report scanning tunneling spectroscopy (STS) measurements of the gap properties of both ceramic MgB2 and c-axis oriented epitaxial MgB2 thin films. Both show a temperature dependent zero bias conductance peak and evidence for two superconducting gaps. We report tunneling spectroscopy of superconductor-insulator-superconductor (S-I-S) junctions formed in two ways in addition to normal metal-insulator-superconductor (N-I-S) junctions. We find a gap delta=2.3-2.8 meV, with spectral features and temperature dependence that are consistent between S-I-S junction types. In addition, we observe evidence of a second, larger gap, delta=7.2 meV, consistent with a proposed two-band model.
dc.description24 pages, 8 figures Text changes and corrected fits in figures Submitted to Superconductor Science and Technology
dc.identifierhttps://arxiv.org/abs/cond-mat/0212194
dc.identifierhttp://arxiv.org/abs/cond-mat/0212194
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/20476
dc.subjectSuperconductivity
dc.titleMgB2 Energy Gap Determination by Scanning Tunneling Spectroscopy
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