Preparation and superconductivity of iron selenide thin films

FeSex (x = 0.80, 0.84, 0.88, 0.92) thin films were prepared on SrTiO3(001) (STO), (La, Sr)(Al, Ta)O-3(001) (LSAT), and LaAlO3(001) (LAO) substrates by a pulsed laser deposition method. All of the thin films show single-phase and c-axis oriented epitaxial growth, and are superconducting. Among them, the FeSe0.88 thin films show a T-c,T-onset of 11.8 K and a T-c,T- (0) of 3.4 K. The upper critical magnetic field is estimated to be 14.0 T.