Anisotropy of upper critical fields and interface superconductivity in FeSe/SrTiO₃ grown by PLD

In this study, we grow FeSe/SrTiO3 with thicknesses of 4-19 nm using pulsed laser deposition and investigate their magneto-transport properties. The thinnest film (4 nm) exhibit negative Hall effect, indicating electron transfer into FeSe from the SrTiO3 substrate. This is in agreement with reports on ultrathin FeSe/SrTiO3 grown by molecular beam epitaxy. The upper critical field is found to exhibit large anisotropy ( ?> 3.