Evidence for two superconducting energy gaps in MgB2 by point-contact spectroscopy

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dc.creatorSzabo, P.
dc.creatorSamuely, P.
dc.creatorKacmarcik, J.
dc.creatorKlein, Th.
dc.creatorMarcus, J.
dc.creatorFruchart, D.
dc.creatorMiraglia, S.
dc.creatorMarcenat, C.
dc.creatorJansen, A. G. M.
dc.date2001-05-30
dc.date2001-08-20
dc.date.accessioned2026-07-07T12:40:43Z
dc.date.available2026-07-07T12:40:43Z
dc.descriptionExperimental support is found for the multiband model of the superconductivity in the recently discovered system MgB2 with the transition temperature Tc = 39 K. By means of Andreev reflection evidence is obtained for two distinct superconducting energy gaps. The sizes of the two gaps (Delta_S = 2.8 meV and Delta_L = 7 meV) are respectively smaller and larger than the expected weak coupling value. Due to the temperature smearing of the spectra the two gaps are hardly distinguishable at elevated temperatures but when a magnetic field is applied the presence of two gaps can be demonstrated close to the bulk T_c in the raw data.
dc.description7 pages incl. 3 figures, final version. accepted for Phys. Rev. Lett
dc.identifierhttps://arxiv.org/abs/cond-mat/0105598
dc.identifierhttp://arxiv.org/abs/cond-mat/0105598
dc.identifierPhys.Rev.Lett.87:137005,2001
dc.identifierdoi:10.1103/PhysRevLett.87.137005
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/219530
dc.subjectSuperconductivity
dc.titleEvidence for two superconducting energy gaps in MgB2 by point-contact spectroscopy
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