Phys. Rev. Lett. 88, 127002 (2002) [4 pages]Evidence for Two-Band Superconductivity from Break-Junction Tunneling on MgB2Received 30 June 2001; published 6 March 2002 Superconductor-insulator-superconductor tunnel junctions have been fabricated on MgB2 that display Josephson and quasiparticle currents. These junctions exhibit a gap magnitude, Δ∼2.5meV, 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. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.127002
DOI:
10.1103/PhysRevLett.88.127002
PACS:
74.50.+r, 73.40.Gk, 74.70.Ad, 74.80.Fp
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