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High-field measurements on the high-T/sub c/ superconductors La/sub 1. 85/Sr/sub 0. 15/CuO/sub 4-//sub delta/ and YBa/sub 2/Cu/sub 3/O/sub 7-//sub delta/

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
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We have measured the superconductive properties of the high-T/sub c/ superconductors La/sub 1.85/Sr/sub 0.15/CuO/sub 4-//sub delta/ and YBa/sub 2/Cu/sub 3/O/sub 7-//sub delta/ in magnetic fields up to 25 tesla. Conservative estimates of the critical field at T = 0 yield respectively 45 +- 5 and 200 +- 25 tesla. The slope (dB/sub c//sub 2//dT) near T/sub c/ for the Y-Ba-Cu-O compound is about twice as large as in La-Sr-Cu-O. For both compounds the magnetoresistivity indicates a large anisotropy of the critical field. The Sommerfeld parameter ..gamma.. is estimated to be respectively 7 and 16 mJ(mole Cu)/sup -1/K/sup -2/, which indicates that the higher T/sub c/ of Y-Ba-Cu-O, when compared with La-Sr-Cu-O, might be primarily due to an increased density of states at the Fermi level.
Research Organization:
Research Institute for Materials and High Field Magnet Laboratory, University of Nijmegen, Toernooiveld, NL-6525 ED Nijmegen, The Netherlands
OSTI ID:
5986259
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 36:10; ISSN PRBMD
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
651000 -- Nuclear Physics
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COMPARATIVE EVALUATIONS
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL FIELD
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY LEVELS
ENERGY-LEVEL DENSITY
FERMI LEVEL
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MAGNETIC FIELDS
MAGNETORESISTANCE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES