High pressure transport and structural studies on Nb₃Ga superconductor

The crystal structure of A-15 superconductor Nb₃Ga with a critical temperature T_c=16.5 K has been investigated by high pressure x-ray diffraction (HPXRD) using synchrotron x-rays and a diamond anvil cell under Ne pressure medium. The high pressure structural results indicate that Nb₃Ga is stable up to 41 GPa. The P–V plot shows an anomaly around 15 GPa even though there are no pressure induced structural transitions are observed. High pressure resistance measurements were performed up to 0.5 GPa to understand the variation of T_c under pressure. Our results show a positive pressure effect on T_c