We studied effect of non-magnetic and magnetic impurities on superconductivity in Lu2Fe3Si5 by small amount substitution of the Lu site, which investigated structural, magnetic, and electrical properties of non-magnetic (Lu1−xScx)2Fe3Si5, (Lu1−xYx)2Fe3Si5, and magnetic (Lu1−xDyx)2Fe3Si5. The rapid depression of Tc by non-magnetic impurities in accordance with the increase of residual resistivity reveals the strong pair breaking dominated by disorder. We provide compelling evidence for the sign reversal of the superconducting order parameter in Lu2Fe3Si5.
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