Dresden 2017 – scientific programme

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MA: Fachverband Magnetismus

MA 60: Magnetic Materials: Applications and Multielement Bulk Materials

MA 60.6: Talk

Friday, March 24, 2017, 10:45–11:00, HSZ 101

Epitaxial thin films of Sr₂MnIrO₆ double perovskites — •Supratik Dasgupta, Philipp Komissinskiy, Hongbin Zhang, and Lambert Alff — Institute of Materials Science, Technische Universität Darmstadt, Germany

We present our studies of highly crystalline epitaxial thin films of a 3d-5d double perovskite Sr₂MnIrO₆ grown by pulsed laser deposition. In this compound, the orbital degeneracy between the t_2g and e_g electron states is lifted with the crystal field of the heavy Ir⁴⁺ cation. Moreover, the t_2g levels are split into low-energy J=3/2 and high-energy J=1/2 states due to the strong spin-orbital coupling, resulting in exotic ground states observed previously in other perovskite iridates [1]. The compressively (tensile) strained Sr₂MnIrO₆ films were grown onto LSAT (SrTiO₃ and DyScO₃) single crystalline substrates. Magnetic measurements of the Sr₂MnIrO₆ films grown on SrTiO₃ reveal T_c=110 K. The observed magnetization values of 0.4 µ_B/f.u. at 5 K can be explained with a Mn antiferromagnetic coupling plus a spin canting due to the tetragonal lattice distortions. The temperature dependence of the Sr₂MnIrO₆ electric resistivity indicates that Sr₂MnIrO₆ is a narrow band-gap insulator.

[1] W. Witczak-Krempa et al., Annu. Rev. Condens. Matter Phys. 5, 57 (2014).