Ultrasonic attenuation measurements in sinter-forged YBa2Cu3O7-

M. F. Xu; D. Bein; R. F. Wiegert; Bimal K. Sarma; M. Levy; Z. Zhao; S. Adenwalla; A. Moreau; Q. Robinson; D. L. Johnson; S. J. Hwu; Kenneth R Poeppelmeier; J. B. Ketterson

doi:10.1103/PhysRevB.39.843

Ultrasonic attenuation measurements in sinter-forged YBa2Cu3O7-

M. F. Xu, D. Bein, R. F. Wiegert, Bimal K. Sarma, M. Levy, Z. Zhao, S. Adenwalla, A. Moreau, Q. Robinson, D. L. Johnson, S. J. Hwu, Kenneth R Poeppelmeier, J. B. Ketterson

Northwestern University

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Abstract

We report ultrasonic attenuation measurements on sinter-forged YBa2Cu3O7- 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.

Original language	English
Pages (from-to)	843-846
Number of pages	4
Journal	Physical Review B
Volume	39
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.39.843
Publication status	Published - 1989

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ASJC Scopus subject areas

Condensed Matter Physics

Cite this

Xu, M. F., Bein, D., Wiegert, R. F., Sarma, B. K., Levy, M., Zhao, Z., Adenwalla, S., Moreau, A., Robinson, Q., Johnson, D. L., Hwu, S. J., Poeppelmeier, K. R., & Ketterson, J. B. (1989). Ultrasonic attenuation measurements in sinter-forged YBa2Cu3O7-. Physical Review B, 39(1), 843-846. https://doi.org/10.1103/PhysRevB.39.843

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title = "Ultrasonic attenuation measurements in sinter-forged YBa2Cu3O7-",

abstract = "We report ultrasonic attenuation measurements on sinter-forged YBa2Cu3O7- 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.",

author = "Xu, {M. F.} and D. Bein and Wiegert, {R. F.} and Sarma, {Bimal K.} and M. Levy and Z. Zhao and S. Adenwalla and A. Moreau and Q. Robinson and Johnson, {D. L.} and Hwu, {S. J.} and Poeppelmeier, {Kenneth R} and Ketterson, {J. B.}",

year = "1989",

doi = "10.1103/PhysRevB.39.843",

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AU - Xu, M. F.

AU - Bein, D.

AU - Wiegert, R. F.

AU - Sarma, Bimal K.

AU - Levy, M.

AU - Zhao, Z.

AU - Adenwalla, S.

AU - Moreau, A.

AU - Robinson, Q.

AU - Johnson, D. L.

AU - Hwu, S. J.

AU - Poeppelmeier, Kenneth R

AU - Ketterson, J. B.

PY - 1989

Y1 - 1989

N2 - We report ultrasonic attenuation measurements on sinter-forged YBa2Cu3O7- 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.

AB - We report ultrasonic attenuation measurements on sinter-forged YBa2Cu3O7- 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.

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10.1103/PhysRevB.39.843