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Systematical doping studies have been carried out to search for the possiblesuperconductivity in the transition metal doped Zr$_5$Ge$_3$ system.Superconductivity up to 5.7K is discovered in the Ru-dopedZr$_5$Ge$_{2.5}$Ru$_{0.5}$ sample. Interestingly, with the same Ru-doping,superconductivity is only induced with doping at the Ge site, but remainsabsent down to 1.8K with doping at the Zr site or interstitial site. Bothmagnetic and transport studies have revealed the bulk superconductivity naturefor Ru-doped Zr$_5$Ge$_{2.5}$Ru$_{0.5}$ sample. The high upper critical field,enhanced electron correlation, and extremely small electron-phonon coupling,have indicated possible unconventional superconductivity in this system, whichwarrants further detailed theoretical and experimental studies.

Superconductivity from site-selective Ru doping studies in Zr$_5$Ge$_3$ compound