Ultrasonic studies of the relation between two-level-tunneling systems, oxygen content, and superconducting transition temperature in YBa sub 2 Cu sub 3 O sub 7 minus. delta
Journal Article
·
· Physical Review (Section) B: Condensed Matter; (USA)
- Metals Research Laboratory and Department of Physics, Brown University, Providence, Rhode Island 02912 (US)
- Division of Engineering and Department of Chemistry, Brown University, Providence, Rhode Island 02912
We have examined the behavior of two-level-tunneling systems (TLS's) in the high-temperature superconductor YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} as a function of decreasing oxygen content, by measuring the temperature dependence of ultrasonic-velocity changes at low temperatures, {ital T}{approx lt}1 K. We find the density of states of the TLS decreases with decreasing oxygen content and varies exponentially with both {ital T}{sub {ital c}} and oxygen content. We interpret these results in light of recent measurements on oxygen-vacancy ordering in oxygen-deficient YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}.
- OSTI ID:
- 5574711
- Journal Information:
- Physical Review (Section) B: Condensed Matter; (USA), Journal Name: Physical Review (Section) B: Condensed Matter; (USA) Vol. 40:7; ISSN PRBMD; ISSN 0163-1829
- 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
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY-LEVEL DENSITY
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POINT DEFECTS
SOUND WAVES
STOICHIOMETRY
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
ULTRASONIC WAVES
VACANCIES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
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
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY-LEVEL DENSITY
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POINT DEFECTS
SOUND WAVES
STOICHIOMETRY
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
ULTRASONIC WAVES
VACANCIES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES