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VOLUME 46 (1987) | ISSUE 9 | PAGE 359
Structural transition in YBa2Cu3O7
X-ray and neutron diffraction methods were used to show that YBa2Cu307 undergoes a structural phase transition, with a subgroup coupling, from the orthorhombic phase (space group D\h)to the tetragonal phase (space group D \h). The crystal structures of the two phases are compared. The mechanism governing the transition and the effect of the structural change on the superconductivity are discussed.