Effect of Lattice Distortions on 90-K Class Superconductors: Y1-xEuxBa2Cu3O7-δ, Yb1-xSmxBa2Cu3O7-δ and Eu(Ba1-xSrx)2Cu3O7-δ
- 1 June 1988
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 27 (6A) , L1058
- https://doi.org/10.1143/jjap.27.l1058
Abstract
X-ray powder diffraction studies show that an oxygen deficient perovskite structure is preserved in the whole range of x for the Y1-x Eu x Ba2Cu3O7-δ and Yb1-x Sm x Ba2Cu3O7-δ system. Resistivity measurements do not show a strong x-dependence of T c for either system which has the large difference of ionic radius between Y and Eu or Yb and Sm. In contrast, T c is more strongly depressed in the Eu(Ba1-x Sr x )2Cu3O7-δ system than in the Y(Ba1-x Sr x )2Cu3O7-δ system. This result gives suggestion that the decrease of T c is due to local distortions of the CuO2 planes induced by Sr substitutions on the Ba sites.Keywords
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