Lattice readjustment of YBa2Cu3O7-ybetween 150 and 300 K: a transmission-microscope study
- 13 February 1989
- journal article
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 1 (6) , 1055-1060
- https://doi.org/10.1088/0953-8984/1/6/003
Abstract
The lattice instability of the high-Tc superconductor YBa2Cu3O7-y has been studied at temperatures between 150 and 300 K by transmission electron microscopy. Anomalous changes in the lattice constant c were observed near 170 and 250 K. The axial ratio b/a was found to vary in a range from 1.014 to 1.018 (error: +or-0.1%), and a tendency towards a reversible orthorhombic-tetragonal phase transition was observed between 170 and 200 K. Possible explanations are proposed.Keywords
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