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

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dc.creatorSeviour, R.
dc.creatorLambert, C. J.
dc.creatorLeadbeater, M.
dc.date1997-12-15
dc.date.accessioned2026-07-07T03:09:38Z
dc.date.available2026-07-07T03:09:38Z
dc.descriptionExperiments 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 Letter we provide a theory of this phenomenon which shows that it originates from an instability in 4 - probe conductance measurements which is absent from 2-probe measurements. We compare the zero-bias,zero-temperature 4-probe conductances $G_{N}$ and $G_{S}$ 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 $δG=G_{S}-G_N$ vanishes, in agreement with quasi-classical theory. However we also predict that there exists macroscopic sample specific fluctuations in $δG$, which lie beyond quasi-classical theory and allow large negative values of $δG$ to occur.
dc.description4 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/9712166
dc.identifierhttp://arxiv.org/abs/cond-mat/9712166
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/27963
dc.subjectSuperconductivity
dc.titleLarge-scale superconductivity-induced conductance suppression in mesoscopic normal-superconducting structures
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