Open AccessTHERMAL EXPANSION COEFFICIENT OF YBa2Cu3O7-x WITHORTHORHOMBIC AND TETRAGONAL PHASES
Author(s) -
Yang Ruan,
Guangshe Li,
Hu Xue-Long,
Dingkun Peng,
Hu Junbao,
Yuheng Zhang
Publication year - 1988
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.37.2034
Subject(s) - thermal expansion , tetragonal crystal system , materials science , condensed matter physics , thermodynamics , physics , chemistry , crystallography , crystal structure , composite material
Thermal expansion coefficient of YBa2Cu3O7-x with the tetragonal and orthorhombic structural phases were measured by the method of differential parallel-plate capacitance. There exist anomalies near 205 K for orthorhombic phase and between 92 K-130 K for tetragonal phase respectively. We suggest that the former may be related to the lattice instability, indicating that there is a strong electronphonon interaction; the latter may result from the structure phase transition which destroys the high Tc superconductivity. A small jump of the thermal expansion coefficient at Tc was observed in the orthorhombic phase and from this the pressure effect was estimated.