Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 52: Magnetic Thin Films II
MA 52.4: Vortrag
Freitag, 20. März 2015, 10:15–10:30, H 1012
Magneto-transport in Sr2IrO4 epitaxial thin films — •Chengliang Lu1,2, Dietrich Hesse1, and Marin Alexe3 — 1Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle (Saale), Germany — 2School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China — 3Department of Physics, Warwick University, Coventry CV4 7AL, United Kingdom
The 5d iridates have been the subject of much recent attention due to the predictions of a large array of novel electronic phases driven by twisting strong spin-orbit coupling and Hubbard correlation. As a prototype, the single layered perovskite Sr2IrO4 was first revealed to host a Jeff=1/2 Mott insulating state. In this material, the approximate energy scale of a variety of interactions, involving spin-orbit coupling, magnetic exchange interaction, and the Mott gap, allows close coupling among the corresponding physical excitations. Here, we systematically investigate the magneto-transport in Sr2IrO4 thin films grown on various substrates inducing different strain states. We found an abnormal magnetoresistance which exhibits no apparent correlation with the magnetization, and interesting crossover behavior in the anisotropic magnetoresistance which probably can be associated with an isospin reorientation. In addition, the strain was revealed to play an important role in mediating the magneto-transport in Sr2IrO4 thin films, which is probably due to the modulation of the Jeff=1/2 state as predicted by Zhang et al. (PRL 111, 246402).