Evidence for two-band superconductivity from break-junction tunneling on MgB2.
作者信息
Schmidt H, Zasadzinski J F, Gray K E, Hinks D G
机构信息
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 , USA.
出版信息
Phys Rev Lett. 2002 Mar 25;88(12):127002. doi: 10.1103/PhysRevLett.88.127002. Epub 2002 Mar 6.
Abstract
Superconductor-insulator-superconductor tunnel junctions have been fabricated on MgB2 that display Josephson and quasiparticle currents. These junctions exhibit a gap magnitude, Delta approximately 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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