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Oxygen Vacancy-Induced Anomalous Hall Effect in a Nominally Non-magnetic Oxide

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Abstract

The anomalous Hall effect, a hallmark of broken time-reversal symmetry and spin–orbit coupling, is frequently observed in magnetically polarized systems. However, its realization in nominally non-magnetic systems remains elusive. Here, we report on the observation of the anomalous Hall effect in nominally non-magnetic KTaO3. Anomalous Hall effect emerges in reduced KTaO3 and shows an extrinsic to intrinsic crossover. A paramagnetic behavior is observed in reduced samples and confirmed using first principles calculations. The observed anomalous Hall effect follows the oxygen vacancy-induced magnetization response, suggesting that the localized magnetic moments of the oxygen vacancies scatter conduction electrons asymmetrically and give rise to the anomalous Hall effect. The anomalous Hall conductivity is found to be insensitive to the scattering rate in the low temperature limit (T < 5 K), implying that the Berry curvature of the electrons on the Fermi surface controls the anomalous Hall effect. Our observations provide a detailed picture of many-body interactions, which trigger the anomalous Hall effect in a non-magnetic system.

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Acknowledgments

NCSU team was supported by the U.S. National Science Foundation under Grant No. NSF DMR-1751455. The authors acknowledge use of the SQUID and PPMS facility in the Department of Materials Science and Engineering at North Carolina State University.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, 27695, USA

    Athby H. Al-Tawhid, Douglas L. Irving & Kaveh Ahadi

  2. The Center for Quantum Information Physics (CQIP), Department of Physics, New York University, New York, 10003, USA

    Jesse Kanter, Mehdi Hatefipour & Javad Shabani

  3. Department of Physics, North Carolina State University, Raleigh, NC, 27695, USA

    Douglas L. Irving, Divine P. Kumah & Kaveh Ahadi

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  1. Athby H. Al-Tawhid
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  2. Jesse Kanter
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  3. Mehdi Hatefipour
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  4. Douglas L. Irving
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  5. Divine P. Kumah
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Correspondence to Kaveh Ahadi.

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Al-Tawhid, A.H., Kanter, J., Hatefipour, M. et al. Oxygen Vacancy-Induced Anomalous Hall Effect in a Nominally Non-magnetic Oxide. J. Electron. Mater. 51, 7073–7077 (2022). https://doi.org/10.1007/s11664-022-09941-9

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  • DOI: https://doi.org/10.1007/s11664-022-09941-9

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