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Theory of the sign of multi-probe conductances for normal and superconducting materials

Allsopp, N. K. and Hui, V. C. and Lambert, Colin and Robinson, S. J. (1994) Theory of the sign of multi-probe conductances for normal and superconducting materials. Journal of Physics: Condensed Matter, 6 (48). pp. 10475-10486. ISSN 0953-8984

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Abstract

We examine equivalent forms of the current-voltage relationship applicable to mesoscopic superconductors and use one of these to derive general conditions for the sign of the conductance in a four-probe measurement. For disordered systems, with well separated voltage probes, where the normal-state conductance is positive, we predict that the sign of the longitudinal four-probe conductance of superconducting wires can be reversed by varying an applied magnetic field, and that at certain critical values of the field, the conductance passes through a singularity.

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: 58142
Deposited By: ep_importer_pure
Deposited On: 24 Oct 2012 15:23
Refereed?: Yes
Published?: Published
Last Modified: 17 Sep 2013 08:40
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/58142

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