Identifying the loss of critical current density in YBa[sub 2]Cu[sub 3]O[sub 7] thin films

Journal Article · Wed Mar 31 23:00:00 EST 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.47.8377· OSTI ID:6701848

Deak, J; McElfresh, M ^[1]; Clem, J R; Hao, Z ^[2]; Konczykowski, M ^[3]; Muenchausen, R; Foltyn, S; Dye, R ^[4]

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1. Physics Department, Purdue University, West Lafayette, Indiana 47907 (United States)
2. Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)
3. Laboratoire des Solides Irradies, CEREM, Ecole Polytechnique, 91128 Palaiseau (France)
4. ERDC, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

The magnetic and magnetotransport behavior of a YBa[sub 2]Cu[sub 3]O[sub 7] thin-film sample was studied by a variety of methods that have been used previously to determine the irreversibility line (IRL). From transport measurements it is possible to identify at least two regions separated by a boundary identified as a vortex-glass transition, with the region below the boundary having zero linear resistance and that above having a low-current linear resistivity which seems to be associated with thermally activated flux motion. Evidence for flux pinning above the glass transition suggests that there is a loss of critical current density ([ital J][sub [ital c]]) rather than an onset of reversible magnetic behavior at the glass transition. The complications of using first-harmonic ac susceptibility ([chi][sub ac]) to define the IRL are discussed. In addition, the third-harmonic [chi][sub ac] is shown to measure the same property that the first-harmonic [chi][sub ac] measures: ac magnetic-field penetration rather than the loss of [ital J][sub [ital c]]. Results and a theoretical model showing that there are significant differences between field-cooled dc magnetization measurements when the data are collected on warming versus collecting data on cooling are presented.

• DOE Contract Number: FG02-90ER45427; W-7405-ENG-82
• OSTI ID: 6701848
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 47:13; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
FILMS
HIGH-TC SUPERCONDUCTORS
MAGNETIC PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES