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On the critical fields and current densities of YBa/sub 2/Cu/sub 3/O/sub 7/ and La/sub 1. 85/Sr/sub 0. 15/CuO/sub 4/ superconductors

Journal Article · · J. Appl. Phys.; (United States)
DOI:https://doi.org/10.1063/1.340242· OSTI ID:5278810
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We report a detailed investigation of the magnetic hysteresis of YBa/sub 2/Cu/sub 3/O/sub 7/ oxide in fields ranging from approx.0.2 Oe to 35 kOe and at different temperatures (4.2less than or equal toTless than or equal to100 K). It is shown that the magnetic behavior is that of a granular type-II superconductor in which strongly superconducting grains are coupled via less superconducting links. As a result, at low-H (Happrox. <20 Oe at 4.2 K) the sample appears like a single superconducting filament while at high enough field (Happrox. >5 kOe) it behaves like a granular superconductor with most of the weak links being broken by the applied field. Five threshold fields are identified charaterizing the above magnetic regimes and the transition between them. It is concluded that the critical current density within the individual grains could attain 10/sup 7/ A/cm/sup 2/.

Research Organization:
Laboratoire de Physique des Solides, Universite Paris-Sud, 91405 Orsay, France
OSTI ID:
5278810
Journal Information:
J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 63:8; ISSN JAPIA
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
&amp; Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CURRENT DENSITY
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
HYSTERESIS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LOW TEMPERATURE
MAGNETIC PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PEROVSKITES
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
TYPE-II SUPERCONDUCTORS
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES