Abstract
The discovery of superconductivity in the nickelate has attracted intensive attention recently. Here, Pr1-xSrxNiO3 (x = 0–0.2) films on SrTiO3 was firstly synthesized by polymer-assisted chemical solution deposition. The structure characterization showed that the film has good c-axis orientation and smooth surface without obvious cracks. With increasing Sr doping content, the out-of-plane lattice constant c gradually increased. The metal-insulator transition of parent phase was suppressed by Sr doping and the metallic behavior for doped films was observed in the whole measured temperature range. Infinite-layer Pr1-xSrxNiO2 films were subsequently obtained via topological reduction by CaH2. However, the out-of-plane lattice constants c was obviously smaller than that of the superconducting Pr1-xSrxNiO2 thin films. The insulating behavior for all of films was consequently observed instead of superconductivity. These results indicated that the high crystallinity and subtle structure regularization may be very important for infinite-layer nickelate to accomplish superconductivity.
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