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

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

2001-10-19

arxiv.org/abs/cond-mat/0110421v1

Phys. Rev. B 65, 184516 (2002)

Physics

Condensed Matter

Superconductivity

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

Scientific paper

10.1103/PhysRevB.65.184516

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.

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