Lorentz-force independence of resistance tails in magnetic fields near T sub c for the low-temperature superconductor granular NbN: A Josephson-junction model

Journal Article · Fri Jun 01 00:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.41.11642· OSTI ID:6974231

Kim, D H; Gray, K E; Kampwirth, R T; Woo, K C; McKay, D M; Stein, J ^[1]

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1. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (US)

The broadened resistive transitions in a granular NbN film have been measured for field orientations {ital both} {ital perpendicular} {ital and} {ital parallel} {ital to} {ital the} {ital current}. These are essentially the same over a span of six orders of magnitude below the normal-state resistance (just above {ital T}{sub {ital c}}) demonstrating the absence of the macroscopic Lorentz force. We show that a model of Josephson coupling between grains, rather than flux motion, can {ital quantitatively} explain the results with no adjustable parameters. Broadening of the resistive transitions of high-temperature superconductors (HTS) has also been shown to be independent of the macroscopic Lorentz force. This research demonstrates unambiguously that resistive losses near {ital T}{sub {ital c}} and the absence of the macroscopic Lorentz force on them are not restricted to exotic HTS.

• DOE Contract Number: W-31-109-ENG-38
• OSTI ID: 6974231
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 41:16; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NIOBIUM NITRIDES
MAGNETORESISTANCE
CRITICAL CURRENT
CURRENT DENSITY
GRANULAR MATERIALS
JOSEPHSON JUNCTIONS
LORENTZ FORCE
MAGNETIC FIELDS
ORIENTATION
SUPERCONDUCTING FILMS
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
FILMS
JUNCTIONS
MATERIALS
NIOBIUM COMPOUNDS
NITRIDES
NITROGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
REFRACTORY METAL COMPOUNDS
SUPERCONDUCTING JUNCTIONS
TRANSITION ELEMENT COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties