Magnetotransport of SrIrO₃ films on (110) DyScO₃

Epitaxial perovskite (110) oriented SrIrO3(SIO) thin films were grown by pulsed laser deposition on (110) oriented DyScO3(DSO) substrateswith various film thicknesst(2 nm<t<50 nm). All the films were produced with stoichiometric composition, orthorhombic phase, and withhigh crystallinity. The nearly perfect in-plane lattice matching of DSO with respect to SIO and same symmetry result in a full epitaxial in-planealignment, i.e., thec-axis of DSO and SIO are parallel to each other with only slightly enlargedd110out-of-plane lattice spacing (+0.38%) due tothe small in-plane compressive strain caused by the DSO substrate. Measurements of the magnetoresistanceMRwere carried out for currentflow along the [001] and [1-10] direction of SIO and magnetic field perpendicular to the film plane.MRappears to be distinctly differentfor both directions. The anisotropyMR001/MR1-10>1 increases with decreasingTand is especially pronounced for the thinnest films, whichlikewise display a hysteretic field dependence belowT∗≈3 K. The coercive fieldHcamounts to 2-5 T. Both,T∗andHcare very similar to themagnetic ordering temperature and coercivity of DSO which strongly suggests substrate-induced mechanism as a reason for the anisotropicmagnetotransport in the SIO films