title: Evidence for two superconducting energy gaps in MgB(2) by point-contact spectroscopy.
abstract: Experimental support is found for the multiband model of the superconductivity in the recently discovered system MgB(2) with the transition temperature T(c) = 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. Because of 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.
authors.affiliation: Institute of Experimental Physics, Slovak Academy of Sciences, SK-04353 Kosice, Slovakia.
authors.forename: P
authors.initials: P
authors.lastname: Szabó
authors.forename: P
authors.initials: P
authors.lastname: Samuely
authors.forename: J
authors.initials: J
authors.lastname: Kacmarcík
authors.forename: T
authors.initials: T
authors.lastname: Klein
authors.forename: J
authors.initials: J
authors.lastname: Marcus
authors.forename: D
authors.initials: D
authors.lastname: Fruchart
authors.forename: S
authors.initials: S
authors.lastname: Miraglia
authors.forename: C
authors.initials: C
authors.lastname: Marcenat
authors.forename: A G
authors.initials: AG
authors.lastname: Jansen