Meissner effect and critical fields in an inhomogeneous Ba/sub 2/HoCu/sub 3/O/sub 7-//sub x/ high-T/sub c/ superconductor
Journal Article
·
· Phys. Rev. B: Condens. Matter; (United States)
The Meissner and diamagnetic shielding effects and the upper, lower, and thermodynamical critical fields have been studied in a Ba/sub 2/HoCu/sub 3/O/sub 7-//sub x/ sample using magnetization measurements in fields up to 55 kOe. The diamagnetic shielding curve shows the existence of a transition at T/sub c/ = 91.5 K followed by a broad transition extending from 85 to 25 K which may be related to inhomogeneities in the oxygen content of the sample. A rather low flux expulsion (13.5%) is observed which we attribute to flux pinning or trapping. We show that the coexistence of superconducting and nonsuperconducting regions within the sample at temperatures just below T/sub c/ leads to strong reductions in the critical magnetic fields.
- Research Organization:
- Departament de Fisica Fonamental, Universitat de Barcelona, Diagonal, 647 08028 Barcelona, Spain
- OSTI ID:
- 6978844
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 38:4; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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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
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL FIELD
HOLMIUM COMPOUNDS
HOLMIUM OXIDES
LIMITING VALUES
MAGNETIC FIELDS
MAGNETIC FLUX
MAGNETIZATION
MEISSNER-OCHSENFELD EFFECT
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
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
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL FIELD
HOLMIUM COMPOUNDS
HOLMIUM OXIDES
LIMITING VALUES
MAGNETIC FIELDS
MAGNETIC FLUX
MAGNETIZATION
MEISSNER-OCHSENFELD EFFECT
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE