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Suppression for Superconductivity by Zn Doping in RBa2Cu3-χZnxO7-y Systems (R=Yb, Er, Y, Dy, Gd, Eu, Sm, and Nd)

並列摘要


Zn substituted RBa2Cu3-xZnxO7-y systems (R=Yb, Er, Y, Dy, Gd, Eu, Sm, and Nd) have been studied. The orthorhombic structure for these systems is retained in the studied range of substitution 0 ≤ x ≤ 0.1. The substitution of Zn for Cu causes a rapid nearly linear depression of superconducting transition T, with increasing Zn concentration x. When Zn content is kept constant, Tc of RBa2Cu3-xZnxO7-y was found to strongly depend on the ionic radius of the rare earth element R. This effect resembles to the ion size effect on Tc in R1-xPrxBa2Cu3O7-y, where Pr substitutes the R site, and in RBa2Cu3-xGaxO7-y, where Ga substitutes Cu(1) sites in Cu-0 chains, although in the RBa2Cu3-xZnxO7-y systems Zn was found to substitute Cu(2) sites in Cu-O2 planes.

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