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Magnetoresistance in Quasi-One-Dimensional Weyl Semimetal (TaSe4)2I

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Abstract

Magnetic field effect on linear and nonlinear conductivity in a quasi-one-dimensional Weyl semimetal with a charge density wave (TaSe4)2I is studied. Longitudinal magnetoresistance in all known regimes of charge-density wave motion (linear conduction, creep, sliding, “Fröhlich superconductivity”) is positive and does not exceed a fraction of per cent. Similar magnetotransport measurements were performed in samples profiled by focused ion beams is such a way that motion of the charge-density wave in them is accompanied by phase slip of the charge-density wave. In such samples, a peak-like non-parabolic negative magnetoresistance is observed in relatively small magnetic fields B ≲ 4 T in the nonlinear conduction regime in both longitudinal and transverse geometries. Our results differ significantly from ones obtained earlier and raise the question concerning conditions for observing the axion anomaly in Weyl semimetals in the Peierls state.

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Acknowledgments

We are grateful to Helmuth Berger for providing the samples and N.I. Fedotov for useful comments.

Funding

I.A. Cohn and S.V. Zaitsev-Zotov acknowledge the support of the Russian Science Foundation (project no. 16-12-10335). S.G. Zybtsev and A.P. Orlov performed sample preparation and their profiling by FIB in the framework of the Russian State task.

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Authors and Affiliations

  1. Kotelnikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Moscow, 125009, Russia

    I. A. Cohn, S. G. Zybtsev, A. P. Orlov & S. V. Zaitsev-Zotov

Authors
  1. I. A. Cohn
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  2. S. G. Zybtsev
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  3. A. P. Orlov
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  4. S. V. Zaitsev-Zotov
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Corresponding author

Correspondence to S. V. Zaitsev-Zotov.

Additional information

Published in Russian in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2020, Vol. 112, No. 2, pp. 93–100.

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Cohn, I.A., Zybtsev, S.G., Orlov, A.P. et al. Magnetoresistance in Quasi-One-Dimensional Weyl Semimetal (TaSe4)2I. Jetp Lett. 112, 88–94 (2020). https://doi.org/10.1134/S0021364020140040

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  • DOI: https://doi.org/10.1134/S0021364020140040

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