Synthesis and Characterizations of Lanthanides Nickelates Thin Films

RE 0.8 Sr 0.2 NiO 3 epitaxial thin films (with RE = Pr or Nd) are grown by pulsed laser deposition on SrTiO 3 and (LaAlO 3 ) 0,3 (Sr 2 TaAlO 6 ) 0,7 (001) (LSAT). Thin films are reduced in RE 0.8 Sr 0.2 NiO 2 and studied in transport properties. In preliminary transport measurements, the transport behavior is close to superconductivity. A study of the chemical composition of the perovskite phase as well as the infinite phase is carried out to determine the impact of the reduction process. In particular, a reduction in the cationic ratio is visible after the completion of the topotactic reduction. In the second part, the study of the impact of strains on the homogeneity of thin films after reduction is carried out. The control of homogeneity by modulating strains depending on the substrate is discussed.