Temperature and Field Dependence of the Energy Gap of MgB2/Pb planar junction

Abstract

We have constructed MgB2/Pb planar junctions for both temperature and field dependence studies. Our results show that the small gap is a true bulk property of MgB2 superconductor, not due to surface effects. The temperature dependence of the energy gap manifests a nearly BCS-like behavior. Analysis of the effect of magnetic field on junctions suggests that the energy gap of MgB2 depends non-linearly on the magnetic field. Moreover, MgB2 has an upper critical field of 15 T, in agreement with some reported Hc2 from transport measurements.

5 pages, 5 figures. Submitted to Phys. Rev. B

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• Time-resolved dynamics of the superconducting two-gap state in MgB2 thin films
• Break-junction technique in application to layered superconductors (Review article)
• Break-Junction Tunneling on MgB_2
• Scanning Tunneling Spectroscopy in MgB 2
• Subharmonic gap structures and Josephson effect in MgB2/Nb micro-constrictions
• Temperature Dependence of Superconducting Gaps in Mg(Al)B2 System Investigated by SnS-Andreev Spectroscopy
• Temperature and field dependence of MgB2 energy gaps from tunneling spectra