Nonlocal resistance oscillations near the superconducting transition

Journal Article · Thu Oct 01 04:00:00 EDT 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.46.9074· OSTI ID:6996643

Glazman, L I ^[1]; Hekking, F W.J. ^[2]; Zyuzin, A ^[3]

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1. Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, 116 Church Street S.E., Minneapolis, Minnesota 55455 (United States)
2. Department of Applied Physics, Delft University of Technology, 2628 CJ Delft (Netherlands)
3. Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221 (United States)

It is shown that the current response to an electric field is strongly nonlocal slightly above the superconducting transition temperature {ital T}{sub {ital c}}. The length scale for nonlocality is defined by the correlation length for superconducting fluctuations {xi}({ital T}) and diverges at {ital T}{sub {ital c}}. This makes it possible to observe the nonlocal part of the conductance in a multiterminal measurement on a sample of size 2{pi}{ital R}{similar to}{xi}({ital T}). The local part, originating from the Aslamazov-Larkin correction to the conductivity, exceeds usual meso- scopic interference effects near {ital T}{sub {ital c}}. We use a simple approach (the time-dependent Ginzburg-Landau equation) to calculate the nonlocal resistances for a ring geometry. We predict that the {ital ratio} of voltages measured by two different sets of probes attached to the same ring should oscillate as a function of the flux with a period equal to the superconducting'' flux quantum. This is strikingly different from the known Aharonov-Bohm effect for rings made of a dirty'' normal metal, where such a ratio should be flux independent.

• OSTI ID: 6996643
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 46:14; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
GINZBURG-LANDAU THEORY
MAGNETIC FLUX
PHYSICAL PROPERTIES
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE