1.IFW Dresden,Dresden,Germany;2.Dresden University of Technology, Department of Physics, Institute for Physics of Solids,Dresden,Germany;3.TU Bergakademie Freiberg,Freiberg,Germany
Abstract:
Epitaxial BaFe1.8Cr0.2As2 thin films with the tetragonal c-axis perpendicular to the thin film surface were grown on (LaAlO3)0.3(Sr2AlTaO6)0.7 (LSAT) single crystalline substrates using pulsed laser deposition (PLD). Resistive measurements indicate the existence of two transitions at temperatures of about 80 K and 40 K. The transition at 80 K is attributed to the structural transition from the high temperature tetragonal phase to the low temperature orthorhombic phase accompanied with the magnetic transition from a paramagnetic to an antiferromagnetic state as known for doped bulk systems. Below T ≈ 40 K the magnetization curves measured perpendicularly to the orthorhombic c-axis in fields up to 9 Tesla show two inflexion points indicating metamagnetic transitions.
