Electron Diffraction Study of Ba2YCu3O7-y(y=0.1-0.2)
- 1 July 1987
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 26 (7A) , L1237
- https://doi.org/10.1143/jjap.26.l1237
Abstract
The space groups of the room temperature- and high temperature-phases of a high T c superconductor Ba2YCu3O7-y (y=0.1-0.2) have been determined to be Pmmm and P4/mmm by convergent-beam electron diffraction. Ribbon shaped diffuse scattering appeared at h=n, k=m/2 along the c * direction when the specimen was cooled, but did not transform into superlattice reflections even at the temperature of liq. He. This deffuse scattering can be originated from zone-boundary soft phonons of the longitudinal (or pseudo one-dimensional breathing) mode due to the one-dimensional O-Cu-O chains.Keywords
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