Large-scale superconductivity-induced conductance suppression in mesoscopic normal-superconducting structures

Seviour, R. and Lambert, C. J. and Leadbeater, M. (1999) Large-scale superconductivity-induced conductance suppression in mesoscopic normal-superconducting structures. Superlattices and Microstructures, 25 (5-6). pp. 639-645. ISSN 0749-6036

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Abstract

Experiments on hybrid superconducting normal-metal structures have revealed that even in the absence of tunnel junctions the onset of superconductivity can lead to a decrease in the electrical conductance by an amount many orders of magnitude greater than e(2)/h. In this paper, we provide a theory of this phenomenon which shows that it originates from an instability in the four-probe conductance which is absent from two-probe measurements. We compare the zero-bias, zero-temperature four-probe conductances GN and Gs of a normal diffusive metal in contact with a superconductor in both the normal (N) and superconducting (S) states, respectively. In the absence of tunnel barriers, the ensemble average of the difference delta G = G(S) - G(N) vanishes, in agreement with quasiclassical theory. However, we also predict that there exist macroscopic sample specific fluctuations in delta G, which lie beyond quasiclassical theory and allow large negative values of 6G to occur. (C) 1999 Academic Press.

Item Type:
Journal Article
Journal or Publication Title:
Superlattices and Microstructures
Uncontrolled Keywords:
/dk/atira/pure/researchoutput/libraryofcongress/qc
Subjects:
ID Code:
58089
Deposited By:
Deposited On:
23 Oct 2012 08:56
Refereed?:
Yes
Published?:
Published
Last Modified:
01 Jan 2020 08:07