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Crystal Hall and crystal magneto-optical effect in thin films of SrRuO3
Ist Teil von
Journal of applied physics, 2020-06, Vol.127 (21)
Ort / Verlag
Melville: American Institute of Physics
Erscheinungsjahr
2020
Link zum Volltext
Quelle
美国小型学会期刊集（AIP Scitation平台）
Beschreibungen/Notizen
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.