Research output: Contribution to Journal/Magazine › Journal article › peer-review
<mark>Journal publication date</mark> | 28/11/1994 |
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<mark>Journal</mark> | Journal of Physics: Condensed Matter |
Issue number | 48 |
Volume | 6 |
Number of pages | 12 |
Pages (from-to) | 10475-10486 |
Publication Status | Published |
<mark>Original language</mark> | English |
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.