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

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

2001-05-30

arxiv.org/abs/cond-mat/0105598v3

Phys.Rev.Lett.87:137005,2001

Physics

Condensed Matter

Superconductivity

7 pages incl. 3 figures, final version. accepted for Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.87.137005

Experimental 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.

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