The Wiedemann-Franz law in a normal metal-superconductor junction

In this paper the influence of superconducting correlations on the thermal and charge conductances in a normal metal-superconductor （NS） junction in the clean limit is studied theoretically. First we solve the quasiclassical Eilenberger equations, and using the obtained density of states we can acqu...

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Bibliographic Details
Published in:Chinese physics B 2011-12, Vol.20 (12), p.404-409
Main Authors: Ghanbari, R, Rashedi, G
Format: Article
Language:English
Subjects:
Charge
Cleaning
Conductance
Electric charge
Electrical junctions
Mathematical analysis
Superconductivity
Thermal conductivity
交界处
定律
法律
温度
电导
超导体
金属
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Summary:In this paper the influence of superconducting correlations on the thermal and charge conductances in a normal metal-superconductor （NS） junction in the clean limit is studied theoretically. First we solve the quasiclassical Eilenberger equations, and using the obtained density of states we can acquire the thermal and electrical conductances for the NS junction. Then we compare the conductance in a normal region of an NS junction with that in a single layer of normal metal （N）. Moreover, we study the Wiedemann-Franz （WF） law for these two cases （iN and NS）. From our calculations we conclude that the behaviour of the NS junction does not conform to the WF law for all temperatures. The effect of the thickness of normal metal on the thermal conductivity is also theoretically investigated in the paper.
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/20/12/127401