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Bulk-modulus anomalies at the superconducting transition of single-phase YBa/sub 2/Cu/sub 3/O/sub 7/

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
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We report sound-velocity measurements on polycrystalline single-phase YBa/sub 2/Cu/sub 3/O/sub 7/ with a T/sub c/ of 90 K. The sound velocity is found to increase as the temperature is reduced from room temperature in contrast to the decrease observed in La/sub 1.85/Sr/sub 0.15/CuO/sub 4/. At T/sub c/ there is no discontinuity in the sound velocity within experimental resolution, as expected from thermodynamic arguments and the small value of dT/sub c//dP. As the temperature is lowered below T/sub c/ the sound velocity increases at a greater rate. A similar increase below T/sub c/ is observed in La/sub 1.85/Sr/sub 0.15/CuO/sub 4/. The magnitude of the sound-velocity increase below T/sub c/ is much larger than observed in conventional superconductors.
Research Organization:
ATandT Bell Laboratories, Murray Hill, New Jersey 07974
OSTI ID:
6324677
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 36:4; 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
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
ELASTICITY
GRANULAR MATERIALS
LOW TEMPERATURE
MATERIALS
MECHANICAL PROPERTIES
MEDIUM TEMPERATURE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLYCRYSTALS
RAYLEIGH SCATTERING
SCATTERING
SOUND WAVES
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
THERMODYNAMIC PROPERTIES
THERMODYNAMICS
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VELOCITY
VERY LOW TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES