Evidence for Two-Band Superconductivity from Break-Junction Tunneling on ${MgB}_{2}$

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6 March 2002

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 88 (12), 127002
https://doi.org/10.1103/physrevlett.88.127002

Abstract

Superconductor-insulator-superconductor tunnel junctions have been fabricated on

{MgB}_{2}

that display Josephson and quasiparticle currents. These junctions exhibit a gap magnitude,

Δ \sim 2.5 meV

, that is considerably smaller than the BCS value, but which clearly and reproducibly closes near the bulk

T_{c}

. In conjunction with fits of the conductance spectra, these results are interpreted as direct evidence of two-band superconductivity.

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This publication has 15 references indexed in Scilit:

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