Doping studies and superconductivity in the transition metal doped Zr5-xTxGe3 system.

Inspired by the discovery of superconductivity in the hexagonal Mn5Si3-type Zr5Sb3 and tetragonal W5Si3-type Hf5Sb3-xRux reported recently, we have carried out systematical studies of searching for possible superconductivity in the transition metal doped Zr5-xTxGe3 (0$\le $x$\le $5) system. Different transition metal species, either with the same Mn5Si3-type hexagonal structure or other different tetragonal W5Si3-type structures, are investigated. The details of evolved phase transitions, new physics, and superconductivity upon doping will be presented and discussed.