Collective creep of vortex bundles in YBa[sub 2]Cu[sub 3]O[sub 7] crystals

Journal Article · Thu Sep 01 00:00:00 EDT 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.50.7188· OSTI ID:7004955

Civale, L; Krusin-Elbaum, L ^[1]; Thompson, J R ^[2]; Holtzberg, F ^[1]

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1. IBM T. J. Watson Research Center, Yorktown Heights, New York 10598-0218 (United States)
2. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6061 (United States)

We present evidence for the crossover between creep of individual vortices and collective creep of vortex bundles from measurements of the relaxation of the persistent currents in YBa[sub 2]Cu[sub 3]O[sub 7] single crystals over long periods of time. In the single-vortex regime at low fields the relaxation is fast and is characterized by an exponent [mu][congruent]0.16, as predicted in the collective-creep scenario. With increasing field, collective bundling of vortices induces a slowdown of the relaxation, with a maximum [mu][congruent]1.4. At even higher fields, [mu] decreases again to about 1 as the size of the bundles grows.

• DOE Contract Number: AC05-84OS21400
• OSTI ID: 7004955
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 50:10; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

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665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ALLOY SYSTEMS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COLLECTIVE EXCITATIONS
COPPER COMPOUNDS
COPPER OXIDES
CURRENTS
ELECTRIC CURRENTS
ENERGY-LEVEL TRANSITIONS
EXCITATION
HIGH-TC SUPERCONDUCTORS
MAGNETIC FIELDS
MAGNETIC FLUX
OXIDES
OXYGEN COMPOUNDS
QUATERNARY ALLOY SYSTEMS
RELAXATION
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES