Fe–Te–Se epitaxial thin films with enhanced superconducting properties

Abstract

Epitaxial Fe?Te?Se thin films were deposited by pulsed laser deposition at 250?600??C on SrTiO3 (100), MgO (100), LaAlO3 (100) and CaF2 (100) single crystal substrates. The best superconducting film was grown on CaF2: ?K and ?K with Tdep?=?300??C and 3?Hz. Critical current density Jc (T?=?4.2?K) was 0.41???106?A?cm?2 at 0?T and 0.23???106?A?cm?2 at 9?T. The angular dependence of Jc shows a broad c-axis correlated peak when B???3?T.