Research output: Contribution to journal › Journal article
|<mark>Journal publication date</mark>||28/11/1994|
|<mark>Journal</mark>||Journal of Physics: Condensed Matter|
|Number of pages||12|
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.