Low-field irreversibility line in bulk YBCO high- T sub c superconductors

Conference · Wed Apr 01 04:00:00 EST 1992 · AIP Conference Proceedings (American Institute of Physics); (United States)

OSTI ID:5000330

Lee, C Y; Song, L W; Kao, Y H ^[1]

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1. Department of Physics and Astronomy, State University of New York at Buffalo, Amherst, NY 14260 (United States)

From the zero-field-cooled and field-cooled ac magnetic susceptibility measurements of bulk ceramic YBa{sub 2}Cu{sub 3}O{sub {ital y}} (YBCCO) high-{ital T}{sub {ital c}} superconductors, a low-field irreversibility line has been found which lies very close to {ital H}{sub {ital cl}}({ital T}) in the {ital H}-{ital T} plane as a result of a strong flux trapping. Although both the real and imaginary parts of the ac magnetic susceptibility in these ceramic samples are very sensitive to the ac field amplitude, no significant irreversible behavior could be observed in the absence of a dc magnetic field. By measuring the ac susceptibilities at constant temperature as a function of dc and ac fields, our results exhibit clear evidence for the existence of a field near {ital H}{sub {ital cl}} that demarcates the transition from a reversible to an irreversible (hysteretic) behavior.

• OSTI ID: 5000330
• Report Number(s): CONF-9109102--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Journal Volume: 251:1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL FIELD
HIGH-TC SUPERCONDUCTORS
MAGNETIC FIELDS
MAGNETIC FLUX
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES