ULTRASONIC STUDY OF HIGH Tc SUPERCONDUCTING SYSTEM
- 1 June 1987
- journal article
- research article
- Published by World Scientific Pub Co Pte Ltd in International Journal of Modern Physics B
- Vol. 01 (02) , 517-520
- https://doi.org/10.1142/s0217979287000797
Abstract
Ultrasonic measurements indicated that there are two structural first order-like phase transitions in the high Tc Ba-Y-Cu-Nb-O system. One is near 200K, the other is right above Tc. It is suggested the heavily suppressed pre-superconducting transition, which provides lattice instability and the soft phonon modes, gives rise to the high Tc.Keywords
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