Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 60: Magnetic Materials: Applications and Multielement Bulk Materials

MA 60.6: Vortrag

Freitag, 24. März 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 t2g and eg electron states is lifted with the crystal field of the heavy Ir4+ cation. Moreover, the t2g 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 Tc=110 K. The observed magnetization values of 0.4 µB/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).

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