Nonlocal paraconductance of small superconducting loops

N. E. Israeloff, F. Yu, Allen M Goldman, R. Bojko

Research output: Contribution to journalArticlepeer-review

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Abstract

The nonlocal current response to an electric field characteristic of the superconducting state has been predicted to be observable in the paraconductive regime above the transition temperature Tc over a length scale set by the correlation length for superconducting fluctuations, Ξ(T). A manifestation of this effect has been found in a multiterminal measurement of a square superconducting loop of characteristic size, L∼Ξ(T). The ratio of the voltages measured by two different sets of probes attached to the loop at different positions is observed to oscillate as a function of the flux threading the loop. This nonlocal effect is distinct from analogous phenomena associated with the coherent transport of electrons in mesoscopic structures.

Original languageEnglish (US)
Pages (from-to)2130-2133
Number of pages4
JournalPhysical Review Letters
Volume71
Issue number13
DOIs
StatePublished - Jan 1 1993

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