Strain induced changes of electronic properties of B-site ordered double perovskite Sr$_2$CoIrO$_6$ thin films

摘要

B-site ordered thin films of double perovskite Sr$_2$CoIrO$_6$ wereepitaxially grown by a metal-organic aerosol deposition technique on varioussubstrates, actuating different strain states. X-ray diffraction, transmissionelectron microscopy and polarized far-field Raman spectroscopy confirm thestrained epitaxial growth on all used substrates. Polarization dependent Co$L_{2,3}$ X-ray absorption spectroscopy reveals a change of the magnetic easyaxis of the antiferromagnetically ordered (high-spin) Co$^{3+}$ sublatticewithin the strain series. By reversing the applied strain direction fromtensile to compressive, the easy axis changes abruptly from in-plane toout-of-plane orientation. The low-temperature magnetoresistance changes itssign respectively and is described by a combination of weak anti-localizationand anisotropic magnetoresistance effects.