Ultrasonic velocity anomalies in superconducting sinter-forged YBa2Cu3O7-

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

doi:10.1103/PhysRevB.39.721

Ultrasonic velocity anomalies in superconducting sinter-forged YBa2Cu3O7-

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

Northwestern University

Research output: Contribution to journal › Article

37 Citations (Scopus)

Abstract

The velocity of ultrasound was measured on sinter-forged polycrystalline YBa2Cu3O7- samples with a superconducting transition temperature of 91 K. The forging process results in crystallites which are preferentially aligned with their c axis aligned parallel to the forging axis as confirmed from optical and x-ray measurements. Sound-velocity measurements show that the material is elastically anisotropic. The temperature dependence of the sound velocity shows distinct anomalies. For propagation parallel to the forging axis, both longitudinal and shear waves displayed a thermal hysteresis between 65 and 260 K; however the longitudinal sound velocity with q^ in the basal plane showed a much smaller thermal hysteresis. No effect of a magnetic field was observed on sweeping the magnetic field to 7.2 T at temperatures of 4 and 86 K.

Original language	English
Pages (from-to)	721-724
Number of pages	4
Journal	Physical Review B
Volume	39
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.39.721
Publication status	Published - 1989

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ASJC Scopus subject areas

Condensed Matter Physics

Cite this

Zhao, Z., Adenwalla, S., Moreau, A., Ketterson, J. B., Robinson, Q., Johnson, D. L., Hwu, S. J., Poeppelmeier, K. R., Xu, M. F., Hong, Y., Wiegert, R. F., Levy, M., & Sarma, B. K. (1989). Ultrasonic velocity anomalies in superconducting sinter-forged YBa2Cu3O7-. Physical Review B, 39(1), 721-724. https://doi.org/10.1103/PhysRevB.39.721

Ultrasonic velocity anomalies in superconducting sinter-forged YBa2Cu3O7-. / Zhao, Z.; Adenwalla, S.; Moreau, A.; Ketterson, J. B.; Robinson, Q.; Johnson, D. L.; Hwu, S. J.; Poeppelmeier, Kenneth R; Xu, M. F.; Hong, Y.; Wiegert, R. F.; Levy, M.; Sarma, Bimal K.

In: Physical Review B, Vol. 39, No. 1, 1989, p. 721-724.

Research output: Contribution to journal › Article

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abstract = "The velocity of ultrasound was measured on sinter-forged polycrystalline YBa2Cu3O7- samples with a superconducting transition temperature of 91 K. The forging process results in crystallites which are preferentially aligned with their c axis aligned parallel to the forging axis as confirmed from optical and x-ray measurements. Sound-velocity measurements show that the material is elastically anisotropic. The temperature dependence of the sound velocity shows distinct anomalies. For propagation parallel to the forging axis, both longitudinal and shear waves displayed a thermal hysteresis between 65 and 260 K; however the longitudinal sound velocity with q^ in the basal plane showed a much smaller thermal hysteresis. No effect of a magnetic field was observed on sweeping the magnetic field to 7.2 T at temperatures of 4 and 86 K.",

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AU - Johnson, D. L.

AU - Hwu, S. J.

AU - Poeppelmeier, Kenneth R

AU - Xu, M. F.

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AU - Wiegert, R. F.

AU - Levy, M.

AU - Sarma, Bimal K.

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AB - The velocity of ultrasound was measured on sinter-forged polycrystalline YBa2Cu3O7- samples with a superconducting transition temperature of 91 K. The forging process results in crystallites which are preferentially aligned with their c axis aligned parallel to the forging axis as confirmed from optical and x-ray measurements. Sound-velocity measurements show that the material is elastically anisotropic. The temperature dependence of the sound velocity shows distinct anomalies. For propagation parallel to the forging axis, both longitudinal and shear waves displayed a thermal hysteresis between 65 and 260 K; however the longitudinal sound velocity with q^ in the basal plane showed a much smaller thermal hysteresis. No effect of a magnetic field was observed on sweeping the magnetic field to 7.2 T at temperatures of 4 and 86 K.

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10.1103/PhysRevB.39.721