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TT: Fachverband Tiefe Temperaturen
TT 30: Complex Oxides
TT 30.9: Vortrag
Mittwoch, 29. März 2023, 11:45–12:00, HSZ 204
Anomalous magnetotransport in SrIrO3 (111) films — •Ji Soo Lim1, Merit Spring1, Martin Kamp1, Louis Veyrat1,2, Axel Lubk2, Bernd Büchner2, Michael Sing1, and Ralph Claessen1 — 1Physikalisches Institut and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg, Würzburg, Germany — 2Leibniz Institute for Solid State and Materials Research and Würzburg-Dresden Cluster of Excellence ct.qmat, Dresden, Germany
Complex oxides provides an inexhaustible playground for the study of interactions between charge, spin, orbital, and lattice degrees of freedom. In particular, spin-orbit coupling can be of comparable magnitude to electron correlations in 5d iridates, leading to exotic quantum phases such as spin liquids and correlated topological semimetals [1]. Perovskite SrIrO3 (SIO) films grown along the <111> direction exhibit a buckled honeycomb lattice, and are predicted to be topological crystalline insulators with a relatively large band gap [2].
Here we report on the epitaxial growth of ultrathin SIO films on SrTiO3 (111) that display a twinned perovskite-like superlattice structure with a periodicity of 3 unit cells and the observation of unusual magnetotransport properties, namely the anomalous Hall effect. We observe a sign change of the magnetoresistance and hysteresis loops with increasing coercive fields below 10 K. By comparing with theoretical results, we discuss the origin of the unusual transport behavior.
[1] J. Chakhalian et al., APL Mater. 8, 050904 (2020)
[2] P. M. Gunnink et al., J. Phys.: Condens. Matter 33, 085601 (2021)