Temperature and field dependence of the energy gap ofMgB2/Pbplanar junctions

Autor:	Yuri Sushko, Mario Freamat, K. W. Ng, Mohamed H. Badr
Rok vydání:	2002
Předmět:	Surface (mathematics) Superconductivity Physics Planar Condensed matter physics Band gap Condensed Matter::Superconductivity Field dependence Critical field Magnetic field
Zdroj:	Physical Review B. 65
ISSN:	1095-3795 0163-1829
DOI:	10.1103/physrevb.65.184516
Popis:	We have constructed ${\mathrm{MgB}}_{2}/\mathrm{Pb}$ planar junctions for both temperature and field dependence studies. Our results show that the small gap is a true bulk property of ${\mathrm{MgB}}_{2}$ 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 ${\mathrm{MgB}}_{2}$ depends nonlinearly on the magnetic field. Moreover, ${\mathrm{MgB}}_{2}$ has an upper critical field of 15 T, in agreement with some reported ${H}_{c2}$ from transport measurements.
Databáze:	OpenAIRE
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