Effect of Lattice Distortions on 90-K Class Superconductors: Y_<1-x>Eu_xBa_2Cu_3O_<7-δ>, Yb_<1-x>Sm_xBa_2Cu_3O_<7-δ> and Eu(Ba_<1-x>Sr_x)_2Cu_3O_<7-δ> : Electrical Properties of Condensed Matter

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X-ray powder diffraction studies show that an oxygen deficient perovskite structure is preserved in the whole range of x for the Y_<1-x>Eu_xBa_2Cu_3O_<7-δ> and Yb_<1-x>Sm_xBa_2Cu_3O_<7-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(Ba_<1-x>Sr_x)_2Cu_3O_<7-δ> system than in the Y(Ba_<1-x>Sr_x)_2Cu_3O<7-δ> system. This result gives suggestion that the decrease of T_c is due to local distortions of the CuO_2 planes induced by Sr substitutions on the Ba sites.
社団法人応用物理学会の論文
1988-06-20