Superconducting gap parameters of MgB2 obtained on MgB2/Ag and MgB2/In junctions

Details Superconducting gap parameters of MgB2 obtained on MgB2/Ag and MgB2/In junctions Superconducting gap parameters of MgB2 obtained on MgB2/Ag and MgB2/In junctions

2001-04-02

arxiv.org/abs/cond-mat/0104038v2

Physica C 368 (2002) 251-254

Physics

Condensed Matter

Superconductivity

revised manuscript

Scientific paper

10.1016/S0921-4534(01)01176-5

MgB2 superconducting wires with critical temperature Tc approaching 40 K were used for preparation of MgB2/Ag and MgB2/In junctions. The differential conductance vs. voltage characteristics of N-S junctions exhibit clear contribution of Andreev reflection. Using modified BTK theory for s-wave superconductors two order parameters 4 meV and 2.6 meV have been determined from temperature dependencies. Surprisingly, larger order parameter vanishes at lower temperature ~20 K than smaller one with Tc 38 K. Both the magnitudes of the order parameters and their critical temperatures are in good agreement with theoretical calculations of electron-phonon coupling in MgB$_2$ carried out by Liu et al.

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