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Effects of Substituting Ni and Zn for Cu in the Electron Doped Sr0.9La0.1CuO2 Superconductor

Research paper by Heon-Jung Kim, C. U. Jung, J. Y. Kim, Min-Seok Park, Mun-Seog Kim, Sung-Ik Lee

Indexed on: 01 May '03Published on: 01 May '03Published in: Journal of low temperature physics



Abstract

We used X-ray diffraction, energy dispersive spectroscopy and low field magnetization to characterize Sr0.9La0.1Cu1−xRxO2 samples for R=Zn and Ni. We found that both Ni and Zn are substituted at the Cu-site. The value of Tc was almost independent of composition until x∼0.03 for R=Zn while it was reduced to 30 K at x∼0.02 for R=Ni. This trend of Tc reduction is very similar to the pair breaking-effect in conventional superconductors and electron-doped (Nd, Ce)2CuO4−δ but the rate of reduction of Tc for R=Ni is larger in Sr0.9La0.1CuO2 than in (Nd, Ce)2CuO4−δ. These results are discussed along with the recent experimental observation of gap symmetry in electron-doped superconductors.