Anisotropic-vortex-flux production and retention in grain-oriented YBa sub 2 Cu sub 3 O sub 7

Journal Article · Sat Feb 01 04:00:00 EST 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.45.3054· OSTI ID:5001901

Liu, L; Kouvel, J S ^[1]; Brun, T O ^[2]

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1. Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60680 (United States)
2. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

Magnetization-vector measurements were made on a zero-field-cooled sample at 4.2 K in an increasing magnetic field ({bold H}) oriented at various angles ({theta}{sub {ital H}}) relative to the {ital a}-{ital b} plane, with {bold H} corrected for demagnetization. For {ital H} above {ital H}{sub {ital c}1}, it is found that {bold M}{sub {ital P}}, the penetrating vortex-flux component of the sample magnetization, forms first at angles ({theta}{sub {ital P}}) relative to {ital a}-{ital b} that are generally much smaller than {theta}{sub {ital H}}. The preference of the initial {bold M}{sub {ital P}} for the {ital a}-{ital b} plane contrasts with the remanent trapped-flux magnetization {bold M}{sub {ital R}}, which is oriented preferentially toward the {ital c} axis. Nevertheless, both phenomena are qualitatively consistent regarding the strong anisotropy of the vortex-pinning forces in the layered crystal structure. Furthermore, it is found that for all {theta}{sub {ital H}} the components of {bold M}{sub {ital P}} along {ital a}-{ital b} and {ital c} versus the corresponding components of {bold H} describe two independent universal curves, suggesting that the vortices produced by {bold H} after zero-field cooling may lie only along {ital a}-{ital b} and/or along {ital c}. However, the results for {bold M}{sub {ital R}} do not obey an analogous scaling and suggest that the path of the trapped vortices may alternate stepwise between {ital a}-{ital b} and {ital c}.

• OSTI ID: 5001901
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 45:6; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
GRAIN ORIENTATION
HIGH-TC SUPERCONDUCTORS
LAYERS
MAGNETIZATION
MICROSTRUCTURE
ORIENTATION
OXIDES
OXYGEN COMPOUNDS
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0000-0013 K
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES