Oxygen Vacancy-Induced Topological Hall effect in a Nonmagnetic Band Insulator

Abstract

The discovery of skyrmions has sparked tremendous interests about topologically nontrivial spin textures in recent times. The signature of noncoplanar nature of magnetic moments can be observed as topological Hall effect (THE) in electrical measurement. Realization of such nontrivial spin textures in new materials and through new routes is an ongoing endeavour due to their huge potential for future ultra-dense low-power memory applications. In this work, we report oxygen vacancy (OV) induced THE and anomalous Hall effect (AHE) in a 5$d^0$ system KTaO${}_3$. The observation of weak antilocalization behavior and THE in the same temperature range strongly implies the crucial role of spin-orbit coupling (SOC) behind the origin of THE. Ab initio calculations reveal the formation of the magnetic moment on Ta atoms around the OV and Rashba-type spin texturing of conduction electrons. In the presence of Rashba SOC, the local moments around vacancy can form bound magnetic polarons (BMP) with noncollinear spin texture, resulting THE. Scaling analysis between transverse and longitudinal resistance establishes skew scattering driven AHE in present case. Our study opens a route to realize topological phenomena through defect engineering.

arXiv commentPublished in Advanced Quantum Technology

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Cited by in corpus (6)

• Oxygen vacancy induced electronic structure modification of KTaO${}_3$
• Electron trapping and detrapping in an oxide two-dimensional electron gas: The role of ferroelastic twin walls
• Oxygen vacancy-induced anomalous Hall effect in a nominally non-magnetic oxide
• Flux-flow instability across Berezinskii Kosterlitz Thouless phase transition in KTaO${}_3$ (111) based superconductor
• Quantum fluctuations lead to glassy electron dynamics in the good metal regime of electron doped KTaO3
• Non-uniform magnetization profile in ferromagnetic heterostructures leading to topological Hall effect like signatures