Nature and stability of the 60-K superconducting phase'' in the YBa sub 2 Cu sub 3 O sub 7 minus. delta. system
Journal Article
·
· Physical Review, B: Condensed Matter; (USA)
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore (India)
Based on electron microscopy, nonresonant microwave absorption, electron paramagnetic resonance, and other studies, it is shown that in the YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} system, compositions with {delta}=0.0--0.20, 0.25, and 0.5 are stable and monophasic, the last two being associated with ordered-oxygen-vacancy structures. The {delta}=0.3--0.4 region ({ital T}{sub {ital c}}{approximately}60 K) is not associated with an ordered-vacancy structure. More importantly, compositions in this region undergo structural changes on annealing at relatively low tempertures, eventually decomposing to the more stable phases. It appears that compositions such as YBa{sub 2}Cu{sub 3}O{sub 6.7} are not thermodynamically stable, casting thereby some doubt on the belief that the 60-K regime represents a genuine single-phase superconducting material.
- OSTI ID:
- 6014459
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 42:10; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Raman-scattering study of high- Tc films of the ordered defect structure YBa sub 2 Cu sub 4 O sub 8 minus. delta
Journal Article
·
Sat Sep 01 00:00:00 EDT 1990
· Journal of Solid State Chemistry; (USA)
·
OSTI ID:6181502
Epitaxial growth and properties of YBa sub 2 Cu sub 3 O sub 7 minus. delta. /NdGaO sub 3 /YBa sub 2 Cu sub 3 O sub 7 minus. delta. trilayer structures
Journal Article
·
Sun Nov 10 23:00:00 EST 1991
· Applied Physics Letters; (United States)
·
OSTI ID:5150181
Raman-scattering study of high- Tc films of the ordered defect structure YBa sub 2 Cu sub 4 O sub 8 minus. delta
Journal Article
·
Fri Nov 30 23:00:00 EST 1990
· Physical Review, B: Condensed Matter; (USA)
·
OSTI ID:5942381
Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ABSORPTION
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELECTROMAGNETIC RADIATION
ELECTRON MICROSCOPY
ELECTRON SPIN RESONANCE
ELEMENTS
HIGH-TC SUPERCONDUCTORS
MAGNETIC RESONANCE
MICROSCOPY
MICROWAVE RADIATION
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHASE STUDIES
PHYSICAL PROPERTIES
POINT DEFECTS
RADIATIONS
RESONANCE
STABILITY
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VACANCIES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ABSORPTION
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELECTROMAGNETIC RADIATION
ELECTRON MICROSCOPY
ELECTRON SPIN RESONANCE
ELEMENTS
HIGH-TC SUPERCONDUCTORS
MAGNETIC RESONANCE
MICROSCOPY
MICROWAVE RADIATION
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHASE STUDIES
PHYSICAL PROPERTIES
POINT DEFECTS
RADIATIONS
RESONANCE
STABILITY
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VACANCIES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES