Effects of Ho3+ Substitution on Ultrasonic Attenuation in Hoba2-xHoxCu3O7-δ Superconductors
| Periodical | Materials Science Forum (Volume 517) |
|---|---|
| Main Theme | Functional Materials and Devices |
| Edited by | A.K. Arof and S.A. Hashim Ali |
| Pages | 17-20 |
| DOI | 10.4028/www.scientific.net/MSF.517.17 |
| Citation | Ahmad K. Yahya et al., 2006, Materials Science Forum, 517, 17 |
| Online since | June, 2006 |
| Authors | Ahmad K. Yahya, A. Ishak, I. Hamadned, R. Abd-Shukor |
| Keywords | Attenuation, Ho123, Superconductor, Ultrasonic |
| Price | US$ 28,- |
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.