Abstract
The crystal structure, electrical, and magnetic properties of the Ni-based ternary compounds Y2NiGe3 and La2NiGe3 have been investigated. Powder X-ray diffraction patterns reveal that both compounds crystallize in the AlB2-derived hexagonal structure with values of the lattice parameters a=4.066(7)Å and c=4.025(1)Å for Y2NiGe3 and a=4.180(2)Å and c=4.334(1)Å for La2NiGe3. A sudden drop to zero value in the ρ(T) curves and the diamagnetic behavior observed in the χac(T) curves conform the occurrence of bulk superconductivity in Y2NiGe3 and La2NiGe3 with TC of 0.553K and 0.394K, respectively. Band structure calculations reveal that superconductivity in these two compounds is most probably from Y 4d electrons and La 5d electrons, respectively.
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