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Effects of Ho3+ Substitution on Ultrasonic Attenuation in Hoba2-xHoxCu3O7-δ Superconductors

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Abstract:

Longitudinal and shear ultrasonic attenuation measurements were performed at 10 MHz in HoBa2-xHoxCu3O7-δ (x=0.0 and 0.15) polycrystalline ceramics between 80 K and 285 K. Longitudinal attenuation profiles showed a large peak around 200 K for superconducting HoBa2Cu3O7-δ but not for oxygen-reduced non-superconducting HoBa2Cu3O7-δ. Two longitudinal attenuation peaks at 190 K and 250 K were observed for Ba-substituted HoBa1.85Ho0.15Cu3O7-δ. The high temperature (∼190 K-200 K) peaks are due to absorption of sound energy during interaction of ultrasound wave with mobile oxygen atoms involved in an oxygen rearrangement process involving Cu-O chains of the materials.

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Periodical:

Materials Science Forum (Volume 517)

Pages:

17-20

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.517.17

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Online since:

June 2006

Authors:

Ahmad K. Yahya, A. Ishak, I. Hamadned, R. Abd-Shukor

Keywords:

Attenuation, Ho123, Superconductor, Ultrasonic

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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