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Magnetic tuning of band topology evidenced by exotic quantum oscillations in the Dirac semimetal EuMnSb2

Kan Zhao1,2,*, Xuejiao Chen3,†, Zhaosheng Wang4,†, Jinyu Liu5, Jiating Wu4, Chuanying Xi4, Xiaodong Lv3, Lei Li6, Zhicheng Zhong3,7,‡ et al.

Philipp Gegenwart1,§

  • 1Experimentalphysik VI, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany
  • 2School of Physics, Beihang University, Beijing 100191, China
  • 3CAS Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
  • 4Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory of the Chinese Academy of Sciences, Hefei 230031, China
  • 5Department of Physics and Astronomy, University of California, Irvine, California 92697, USA
  • 6Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials and Engineering, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an 710072, China
  • 7College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China

  • *Corresponding author: kan_zhao@buaa.edu.cn
  • †These authors contributed equally to this work.
  • ‡Corresponding author: zhong@nimte.ac.cn
  • §Corresponding author: philipp.gegenwart@physik.uni-augsburg.de
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Phys. Rev. B 107, L081112 – Published 22 February, 2023

DOI: https://doi.org/10.1103/PhysRevB.107.L081112

Abstract

Interplay between magnetism and electronic band topology is of central current interest in topological matter research. We use quantum oscillations as a powerful tool to probe the evolution of band topology in the Dirac semimetal EuMnSb2. The Eu local 4f magnetic moments display different antiferromagnetic states below 25 K and a field-polarized phase above 16 T. Upon cooling from 65 K into the field-polarized state, an exotic temperature-dependent shift of oscillation peaks arises, accompanied by the development of nonzero Berry phase and a huge unconventional splitting of the oscillations. Band-structure calculations confirm the change from trivial to nontrivial band topology induced by the ferromagnetic Eu state, classifying EuMnSb2 as a unique magnetic topological semimetal.

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Corrections

20 April, 2023

Correction: The previously published Figure 1 was edited incorrectly during the proof production process, resulting in the improper rendering of two axis labels in panels (a) and (b). The entire figure has been replaced.

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Phys. Rev. B 107, L081112– Published 22 February, 2023
  • Received 9 February 2022
  • Revised 19 December 2022
  • Accepted 7 February 2023
  • Corrected 20 April 2023
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