Intrinsic tunable anomalous Hall effect induced by momentum-space Berry curvature in SrRuO<sub>3</sub>

Broken time-reversal symmetry and spin-orbit coupling (SOC) in strongly correlated ferromagnetic materials are expected to induce novel phenomena. One of these ferromagnetic materials, SrRuO₃ (SRO), is well-known for showing non-monotonous anomalous Hall effect (AHE), which is produced due to magnetic monopoles, or large Berry curvature in momentum space. Recently, we observed an abnormal behavior of AHE in SRO ultrathin films. To explain this, we measured angle-resolved photoemission spectroscopy (ARPES) of SRO ultrathin film. We found that non-monotonous AHE is induced by band-structure nodal lines, which open a gap due to SOC and magnetization. By changing temperature and thickness of SRO, the sign of AHE can be tunable with a variation of large Berry curvature.

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Bulletin of the American Physical Society

APS March Meeting 2020

Volume 65, Number 1

Monday–Friday, March 2–6, 2020; Denver, Colorado

Session U61: Metal-Insulator transition in 4d/5d oxides

Abstract: U61.00008 : Intrinsic tunable anomalous Hall effect induced by momentum-space Berry curvature in SrRuO3

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Abstract: U61.00008 : Intrinsic tunable anomalous Hall effect induced by momentum-space Berry curvature in SrRuO₃