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

2); Astronomy; Egypt.); Faculty of Science; K.-W. Ng (1) ((1) Department of Physics; Mario Freamat (1); Menoufiya University; Mohamed H. Badr (1; University of Kentucky; U.S.A. (2) Department of Physics

arxiv: cond-mat/0110421 · v1 · submitted 2001-10-19 · ❄️ cond-mat.supr-con

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

Mohamed H. Badr (1 , 2) , Mario Freamat (1) , Yuri Sushko (1) , K.-W. Ng (1) ((1) Department of Physics , Astronomy , University of Kentucky , U.S.A. (2) Department of Physics

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Faculty of Science Menoufiya University Egypt.)

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classification ❄️ cond-mat.supr-con

keywords fieldmgb2dependenceenergytemperaturejunctionsmagneticplanar

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

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