We have substituted magnetic Ni and nonmagnetic Zn impurities at Cu sites, in order to probe the nature of the superconductivity for the electron-doped infinite-layer superconductor Sr0.9La0.1CuO2. We found that T-c was nearly constant until 3% replacement by Zn while the superconductivity was nearly suppressed for a 2% substitution by Ni. This behavior is very similar to that of conventional superconductors, but quite different from typical holed-doped cuprate superconductors.
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