Magnetic measurements of the upper and lower critical fields of oxygen-deficient YBa sub 2 Cu sub 3 O sub 7 minus. delta. single crystals
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (USA)
- Department of Physics, University of California-Davis, Davis, California 95616 (USA)
We present dc-magnetization measurements in fields up to 5 T on oxygen-deficient ({ital T}{sub {ital c}}{congruent}60 K) YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} single crystals. The upper-critical-field slopes are {minus}2.0 and {minus}8.7 T/K and the lower critical fields at 5 K are 83 and 25 Oe for fields perpendicular and parallel to the Cu-O planes, respectively. The upper-critical-field slope anisotropy is not substantially different from the anisot- ropy found for the 90-K crystals. The {ital H}{sub {ital c}1} values are, however, much smaller for the 60-K crystals. We explain these results through a model in which the chains do not contribute significantly to the coupling between the Cu-O planes but rather serve as a charge reservoir for the superconductivity that occurs in the planes.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5561958
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:16; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL FIELD
CRYSTAL MODELS
CRYSTALS
ELEMENTS
HIGH-TC SUPERCONDUCTORS
LIMITING VALUES
MAGNETIC FIELDS
MAGNETIZATION
MATHEMATICAL MODELS
MONOCRYSTALS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
SUBSTOICHIOMETRY
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES