Ultrasonic attenuation measurements in sinter-forged YBa/sub 2/Cu/sub 3/O/sub 7-//sub delta/

Journal Article · Sun Jan 01 04:00:00 EST 1989 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.39.843· OSTI ID:6552003

Xu, M; Bein, D; Wiegert, R F; Sarma, B K; Levy, M; Zhao, Z; Adenwalla, S; Moreau, A; Robinson, Q; Johnson, D L; others, and

We report ultrasonic attenuation measurements on sinter-forged YBa/sub 2/Cu/sub 2/O/sub 7-//sub delta/ material, which differs from ordinary sintered material in that the crystallites are preferentially oriented to form a uniaxial sample. Three peaks in attenuation, at temperatures of 250, 180, and 70 K, were observed for longitudinal waves propagating perpendicular to the forging axis, which is similar to that reported in ordinary (isotropic) polycrystalline samples. However, for both transverse and longitudinal sound propagated along the forging axis we have a different behavior, with only one peak at 180 K, showing a strong anisotropy. It is suggested that sound waves traveling parallel to and normal to the Cu-O planes may account for the anisotropic effect, and a relaxation mechanism may explain the increase in shear wave attenuation which was seen with decreasing temperature.

• Research Organization: Physics Department, University of Wisconsin: Milwaukee, Milwaukee, Wisconsin 53201
• OSTI ID: 6552003
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 39:1; ISSN PRBMD
• Country of Publication: United States
• Language: English

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
ANISOTROPY
ATTENUATION
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
OXIDES
OXYGEN COMPOUNDS
SOUND WAVES
TRANSITION ELEMENT COMPOUNDS
ULTRASONIC WAVES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES