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

H. Schmidt; J. F. Zasadzinski; K. E. Gray; D. G. Hinks

doi:10.1103/PhysRevLett.88.127002

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

H. Schmidt, J. F. Zasadzinski, K. E. Gray, D. G. Hinks

DOI 10.1103/PhysRevLett.88.127002 · Physical Review Letters

T1

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Abstract

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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	39	Pressure not reported	unknown
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	onset