Elastic constant anomalies in sinter-forged high-Tc superconductor YBa2Cu3O7 - δ

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, M. Levy, Bimal K. Sarma

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Abstract

The ultrasound velocity in the sinter-forged YBa2Cu3O7 - δ superconductor was measured and the results showed evident anomalies as well as anisotropies. Both longitudinal and shear wave velocity along the c axis (the forging axis) showed a distinct thermal hysteresis from 65 K to 260 K. The velocity change ΔV V from room temperature to 4 K was 1.5%. The sound velocity along the "basal plane" reached a maximum around 160 K. No distinct thermal hysteresis was observed. ΔV V from room temperature to 4 K was 1%. All of these velocities were measured while sweeping the magnetic field up to 9 T at fixed temperatures of 4 K and 86 K respectively. No velocity change was observed. The shear wave velocity behaved similarly at 9 T during the thermal cycling between room temperature and 4 K.

Original languageEnglish
Pages (from-to)451-454
Number of pages4
JournalJournal of the Less-Common Metals
Volume149
Issue numberC
DOIs
Publication statusPublished - Apr 15 1989

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ASJC Scopus subject areas

  • Engineering(all)

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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., Levy, M., & Sarma, B. K. (1989). Elastic constant anomalies in sinter-forged high-Tc superconductor YBa2Cu3O7 - δ. Journal of the Less-Common Metals, 149(C), 451-454. https://doi.org/10.1016/0022-5088(89)90522-5