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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2003     Display Documents



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ID: 7469.0, MPI für Festkörperforschung / FKF Publikationen 2003
Point-contact spectroscopy of MgB2
Authors:Samuely, P.; Szabó, P.; Kačmarčik, J.; Klein, T.; Jansen, A. G. M.
Language:English
Date of Publication (YYYY-MM-DD):2003
Title of Journal:Physica C
Volume:385
Issue / Number:1-2
Start Page:244
End Page:254
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:Point-contact spectroscopy measurements on magnesium diboride
reveal the existence of two superconducting energy gaps closing
at the same transition temperature in line with the multi-band
model of superconductivity. The sizes of the two gaps
(Delta(pi) = 2.8 meV and Delta(sigma) = 6.5-7 meV) are
respectively smaller and larger than the expected weak coupling
value of the one-gap superconductor. The smaller gap is rapidly
filled by a small magnetic field of about 1-2 T much lower than
the real upper critical field H-c2. The larger gap is closed at
the anisotropic H-c2. Above the gap energies reproducible non-
linearities are observed at the characteristic phonon energies
of MgB2. (C) 2002 Elsevier Science B.V. All rights reserved.
Free Keywords:multi-gap superconductivity; point contact tunneling
spectroscopy; phonons; upper critical field
External Publication Status:published
Document Type:Article
Communicated by:Michaela Asen-Palmer
Affiliations:MPI für Festkörperforschung
External Affiliations:; Slovak Acad Sci, Inst Phys Expt, Watsonova 47, SK-04353 Kosice, Slovakia
; Univ Grenoble 1, F-38041 Grenoble 9, France
; Grenoble High Magnet Field Lab, MPI, FKF, F-38042 Grenoble, France
; CNRS, F-38042 Grenoble, France
Identifiers:ISI:000180663000028
ISSN:0921-4534
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