Journal
PHYSICAL REVIEW LETTERS
Volume 87, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.87.137005
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Experimental support is found for the multiband model of the superconductivity in the recently discovered system MgB2 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 gap. (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 gap, are hardly distinguishable at elevated temperatures, but when a magnetic field is applied the presence of two gap, can be demonstrated close to the bulk T-c in the raw data.
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