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Sign-reversed anomalous Nernst effect in the ferromagnetic Weyl-semimetal Fe3−δGeTe2: the role of Fe vacancies

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Abstract

Anomalous Nernst effect, as a thermal partner of anomalous Hall effect, is particularly sensitive to the Berry curvature anomaly near the Fermi level, and has been used to probe the topological nature of quantum materials. In this work, we report the observation of both effects in the ferromagnetic Weyl-semimetal Fe3−δGeTe2 with tunable Fe vacancies. With decreasing Fe vacancies, the anomalous Hall conductivity evolves as a function of the longitudinal conductivity from the hopping region to the region where the intrinsic Berry curvature contribution dominates. Concomitant evolutions in the anomalous Nernst signal and the anomalous off-diagonal thermoelectric coefficient are observed below the Curie temperature, displaying a unique sign change caused by the Fe vacancies. Combining these results with first-principles calculations, we argue that the Fe-vacancy concentration plays a unique role in simultaneously tuning the chemical potential and ferromagnetism, which in turn controls the Berry curvature contribution in this family of ferromagnetic topological semimetals.

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Author notes

  1. These authors contributed equally to this work.

Authors and Affiliations

  1. School of Physics and Hangzhou Key Laboratory of Quantum Matters, Hangzhou Normal University, Hangzhou, 311121, China

    Haiyang Yang, Qi Wang, Junwu Huang, Zhouliang Wang, Keqi Xia, Chao Cao, Jianhui Dai & Yuke Li

  2. Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, 230031, China

    Haiyang Yang & Mingliang Tian

  3. Department of Physics, Zhejiang University, Hangzhou, 310058, China

    Chao Cao

  4. Zhejiang Province Key Laboratory of Quantum Technology and Device, Zhejiang University, Hangzhou, 310027, China

    Zhuan Xu

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  1. Haiyang Yang
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Corresponding authors

Correspondence to Chao Cao, Jianhui Dai or Yuke Li.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant Nos. U1932155, 11874136, 11874137, and U19A2093), the National Key Projects for Research and Development of China (Grant No. 2019YFA0308602), and the Key R&D Program of Zhejiang Province China (Grant No. 2021C01002). Yu-Ke Li was also supported by an open program from Wuhan National High Magnetic Field Center (Grant No. 2016KF03). The authors thank Yongkang Luo and Huiqiu Yuan for fruitful discussions and valuable comments.

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The supporting information is available online at http://phys.scichina.com and https://link.springer.com. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.

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Yang, H., Wang, Q., Huang, J. et al. Sign-reversed anomalous Nernst effect in the ferromagnetic Weyl-semimetal Fe3−δGeTe2: the role of Fe vacancies. Sci. China Phys. Mech. Astron. 65, 117411 (2022). https://doi.org/10.1007/s11433-022-1938-0

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