Evidence for Two-Band Superconductivity from Break Junction Tunneling on MgB2

Details Evidence for Two-Band Superconductivity from Break Junction Tunneling on MgB2 Evidence for Two-Band Superconductivity from Break Junction Tunneling on MgB2

2001-12-08

arxiv.org/abs/cond-mat/0112144v2

Phys. Rev. Lett. 88, no. 12, pp. 127002 (2002)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures; minor revisions

Scientific paper

10.1103/PhysRevLett.88.127002

Superconductor-insulator-superconductor tunnel junctions have been fabricated on MgB2 that display Josephson and quasiparticle currents. These junctions exhibit a gap magnitude, Delta~2.5 meV, that is considerably smaller than the BCS value, but which clearly and reproducibly closes near the bulk Tc. In conjunction with fits of the conductance spectra, these results are interpreted as direct evidence of two-band superconductivity.

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