Pressure-induced linear enhancement of the superconducting transition in NdSrNiOthin films.

We report the pressure () effect on the superconducting transition temperatureand the upper critical fieldof infinite-layer NdSrNiOthin films by measuring the electrical transport properties under various hydrostatic pressures to 4.6 GPa. At ambient pressure, it shows the clear superconducting transition with∼ 10 K. Based on the evolution of resistance(), we found that theis monotonically enhanced to ∼14 K upon increasing pressure to 2.9 GPa. The constructed temperature-pressure phase diagram indicates that the calculated slope d/dis about 1.14 K GPaand the superconductingshows no signatures of saturation with pressure. It thus gives the possibility to further enhanceby employing higher pressures or heterostructure engineering. In addition, the normalized slope of upper critical field(0) implies that the electron correlations are gradually decreasing with pressure, which exhibits an opposite evolution with superconducting. Our work further confirms the positive pressure effects in nickelate superconductors and gives more insight to further enhance its superconducting transition temperature.