Recently, superconductivity with onset transition temperature (Tconset) over 40 K was achieved in La3Ni2O7 and (La,Pr)3Ni2O7 thin films at ambient pressure due to in-plane compressive strain. However, the Tc in these thin films are lower than that of the bulk bilayer nickelates under pressure. Here we report the enhancement of Tconset from about 30 K to over 48 K by applying hydrostatic pressure on the compressively strained bilayer nickelate thin films. The Tconset firstly ramps up with pressure, then it slightly drops down after reaching the maximum Tconset at about 48.5 K. Our theoretical calculations yield a cooperative enhancement of magnetic fluctuations between and within the layers and increased metallicity under pressure. These findings highlight the critical role of the interplay between interlayer and intralayer electronic correlations in bilayer nickelate superconductors and point to the potential of tuning Tc through controlled manipulation of the electronic structure and interactions. Recently, superconductivity was achieved in La3Ni2O7 and (La,Pr)3Ni2O7 thin films at ambient pressure due to in-plane compressive strain. Here, the authors report the enhancement of the superconducting onset from about 30 K to over 48 K by applying hydrostatic pressure to the films.
Li et al. (Fri,) studied this question.