Crystal Hall and crystal magneto-optical effect in thin films of SrRuO3
Samanta K, Lezaic M, Merte M, Freimuth F, Bluegel S, Mokrousov Y (2020)
Publication Type: Journal article
Publication year: 2020
Journal
Book Volume: 127
Article Number: 213904
Journal Issue: 21
DOI: 10.1063/5.0005017
Abstract
Motivated by the recently observed topological Hall effect in ultra-thin films of SrRuO 3 (SRO) grown on the SrTiO 3 [001] substrate, we investigate the magnetic ground state and anomalous Hall response of the SRO ultra-thin films by virtue of spin density functional theory (DFT). Our findings reveal that in the monolayer limit of an SRO film, a large energy splitting of Ru-t 2 g states stabilizes an anti-ferromagnetic (AFM) insulating magnetic ground state. For the AFM ground state, our Berry curvature calculations predict a large anomalous Hall response upon doping. From the systematic symmetry analysis, we uncover that the large anomalous Hall effect arises due to a combination of broken time-reversal and crystal symmetries caused by the arrangement of non-magnetic atoms (Sr and O) in the SRO monolayer. We identify the emergent Hall effect as a clear manifestation of the so-called crystal Hall effect in terminology of Šmejkal et al., Crystal Hall effect in collinear antiferromagnets (2019), and demonstrate that it persists at finite frequencies, which is the manifestation of the crystal magneto-optical effect. Moreover, we find a colossal dependence of the anomalous Hall effect on the degree of crystal symmetry breaking also in ferromagnetic SRO films, which all together points to an alternative explanation of the emergence of the topological Hall effect observed in this type of systems.
Involved external institutions
Germany (DE)How to cite
APA:
Samanta, K., Lezaic, M., Merte, M., Freimuth, F., Bluegel, S., & Mokrousov, Y. (2020). Crystal Hall and crystal magneto-optical effect in thin films of SrRuO3. Journal of Applied Physics, 127(21). https://doi.org/10.1063/5.0005017
MLA:
Samanta, Kartik, et al. "Crystal Hall and crystal magneto-optical effect in thin films of SrRuO3." Journal of Applied Physics 127.21 (2020).
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