Irreversible behavior of the transport critical current in polycrystalline YBa sub 2 Cu sub 3 O sub y

Journal Article · Mon Nov 27 04:00:00 EST 1989 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.102361· OSTI ID:5301880

Obara, H; Yamasaki, H; Kimura, Y; Kosaka, S ^[1]

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1. Electrotechnical Laboratory, Umezono 1-1-4, Tsukuba-shi, Ibaraki 305, Japan (JP)

Temperature and magnetic field dependence of the critical current density {ital J}{sub {ital c}} and magnetization of the polycrystalline high {ital T}{sub {ital c}} oxide superconductor YBa{sub 2}Cu{sub 3}O{sub {ital y}} have been measured. At low temperature, {ital J}{sub {ital c}} shows a different temperature dependence between field cooling and zero-field cooling, that is, the {ital J}{sub {ital c}} value measured when the sample was cooled in a fixed magnetic field was larger than that measured when the sample was cooled in zero magnetic field and then a magnetic field was applied. This irreversible behavior of {ital J}{sub {ital c}} disappeared at a reduced temperature difference 1{minus}{ital t} proportional to {ital H}{sup 2/3} ({ital H} is the magnetic field). Moreover, we have observed that the slope {ital dV}/{ital dJ} just above {ital J}{sub {ital c}} began to increase rapidly with increasing temperature above 70 K. These experimental results can be attributed to the effects of grain boundaries.

• OSTI ID: 5301880
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 55:22; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COOLING
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CRYSTAL STRUCTURE
CRYSTALS
CURRENT DENSITY
CURRENTS
DATA
ELECTRIC CURRENTS
EXPERIMENTAL DATA
GRAIN BOUNDARIES
INFORMATION
LOW TEMPERATURE
MAGNETIC FIELDS
MICROSTRUCTURE
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PEROVSKITES
POLYCRYSTALS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
TYPE-II SUPERCONDUCTORS
VERY LOW TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES