Publication: Anomalous elastic response of HoBa2-xHoxCu 3O7-? ceramic superconductors
Date
2004
Authors
Yahya A.K.
Hamid N.A.
Abd-Shukor R.
Imad H.
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Journal ISSN
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Abstract
Anomalous elastic response has been observed in superconducting HoBa 2-xHoxCu3O7-? (x = 0 and 0.15) from temperature dependent ultrasonic velocity measurements between 80 and 270 K. Longitudinal velocity of superconducting HoBa2Cu3O 7-? (Tczero ? 89 K) showed an anomaly around 230 K indicating a pronounced lattice stiffening. Superconducting HoBa 1.85Ho0.15Cu3O7-? (T czero ? 70 K) also showed a similar longitudinal velocity anomaly around the same temperature. No anomaly was observed for oxygen-reduced non-superconducting HoBa2Cu3O7-?. Temperature dependent shear velocity profiles and absolute velocity measurements at 80 K are also reported and the influence of oxygen content on elastic properties is discussed. � 2004 Elsevier Ltd. and Techna Group S.r.l. All rights reserved.
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Keywords
A. Powders: solid state reaction , B. Microstructure-final , D. Oxide superconductors , Elastic properties , Ceramic materials , Elastic moduli , Lattice constants , Oxide superconductors , Oxygen , Stiffness , Elastic properties , Microstructure-final , Solid state reactions , Holmium compounds