Chiral anomaly induced negative magnetoresistance and weak anti-localization in Weyl semimetal Bi0.97Sb0.03 alloy

P. Kumar, V. Nagpal, Sudesh, S. Patnaik

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Experimental access to massless Weyl fermions through topological materials promises substantial technological ramifications. Here, we report magneto-transport properties of Bi1−xSbx alloy near the quantum critical point x = 3% and 3.5%. The two compositions that are synthesized and studied are single crystals of Bi0.97Sb0.03 and Bi0.965Sb0.035. We observe a transition from semimetal to semiconductor with the application of magnetic field in both specimens. An extremely large transverse magnetoresistance (MR) 1.8 × 105% and 8.2 × 104% at 2.5 K and 6 T is observed in Bi0.97Sb0.03 and Bi0.965Sb0.035, respectively. Kohler scaling of transverse MR reveals the crossover from low field quadratic MR to a high field linear MR at low temperatures in both samples. A decrease in longitudinal MR is observed only in Bi0.97Sb0.03 that implies the presence of chiral anomaly associated with the Weyl state at the crossover point (x = 0.03) in Bi1−xSbx system. The chiral anomaly is absent for the sample Bi0.965Sb0.035. A sharp increase in longitudinal resistivity for Bi0.97Sb0.03 close to zero magnetic fields indicates the weak anti-localization effect in Bi0.97Sb0.03. Extremely high carrier concentrations and high mobilities have been recorded for both the samples.

Original languageEnglish
Article number055601
JournalJournal of Physics Condensed Matter
Volume34
Issue number5
DOIs
StatePublished - 2 Feb 2022
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2021 IOP Publishing Ltd Printed in the UK

Keywords

  • Kohler scaling
  • Magnetoresistance
  • Topological insulators
  • Weyl semimetals

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