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Superconductivity-induced conductance suppression in mesoscopic solids

Hui, V. C. and Lambert, Colin (1993) Superconductivity-induced conductance suppression in mesoscopic solids. Journal of Physics: Condensed Matter, 5 (50). L651-L662. ISSN 0953-8984

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Abstract

We examine the change deltaG in the two-probe electrical conductance G of a mesoscopic sample due to the switching on of superconductivity and prove that when conductance of the normal mesoscopic host is sufficiently high, the onset of superconductivity always produces a decrease in G. If the superconducting order parameter is of magnitude DELTA, we focus attention on the susceptibility chiDELTA = lim(DELTA-->0) partial derivative G(DELTA)/partial derivative (DELTA2). For weakly disordered, (i.e. ballistic) normal hosts, the average value of this quantity is negative. For diffusive hosts, the mean of chiDELTA increases linearly with [N - G(0)], where N is the number of open channels in the external, current carrying probes, while the fluctuations about the mean are found to be independent of G(0). With increasing normal disorder, chiDELTA undergoes a transition to a region of large fluctuations, before approaching a strongly localized regime, where typical values of chiDELTA are of order [ln2G(0)]-1.

Item Type: Article
Journal or Publication Title: Journal of Physics: Condensed Matter
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 58131
Deposited By: ep_importer_pure
Deposited On: 24 Oct 2012 13:55
Refereed?: Yes
Published?: Published
Last Modified: 17 Sep 2013 08:40
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/58131

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