Giant negative magnetoresistance in a topological hourglass candidate

ORAL

Abstract

Non-symmorphic materials have been recently predicted to host protected surface fermions displaying hourglass dispersion [1]. Here we report the physical properties of Eu5In2Sb6 single crystals crystallizing in the non-symmorphic space group Pbam (55) [2]. Our results show that Eu5In2Sb6 is a narrow-gap antiferromagnetic insulator that exhibits giant negative magnetoresistance driven by magnetic polarons. We discuss the potential surface states in Eu5In2Sb6, and the role of magnetic correlations on hourglass fermions.

[1] Z. Wang, A. Alexandradinata, R. J. Cava, and B. A. Bernevig, Nature 532, 190 (2016).
[2] Wieder et al., Science 361, 246 (2018).

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Presenters

  • Priscila Rosa

    Los Alamos National Laboratory, MPA-CMMS, Los Alamos National Laboratory, Los Alamos, USA, Condensed Matter and Magnet Sciences, Los Alamos National Laboratory

Authors

  • Priscila Rosa

    Los Alamos National Laboratory, MPA-CMMS, Los Alamos National Laboratory, Los Alamos, USA, Condensed Matter and Magnet Sciences, Los Alamos National Laboratory

  • Satya K Kushwaha

    Pulsed Field Facility, NHMFL

  • Marein Rahn

    Los Alamos National Laboratory, LANL

  • Marc Janoschek

    Los Alamos National Laboratory, LANL

  • Eric Bauer

    Los Alamos National Laboratory, Los Alamos, NM 87545, USA, Los Alamos National Laboratory, MPA-CMMS, Los Alamos National Laboratory, Los Alamos, USA, MPA-CMMS, Los Alamos National Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico, USA, Los Alamos National Labs

  • Mun Keat Chan

    Pulsed Field Facility, NHMFL, MPA-MAG, Los Alamos National Laboratory, Los Alamos, USA, National High Magnetic Field Laboratory, LANL, Los Alamos National Laboratory

  • Neil Harrison

    Pulsed Field Facility, NHMFL, MPA-MAG, Los Alamos National Laboratory, Los Alamos National Laboratory, MPA-MAG, Los Alamos National Laboratory, Los Alamos, USA

  • Joe D Thompson

    Los Alamos National Laboratory, MPA-CMMS, Los Alamos National Laboratory, Los Alamos, USA, MPA-CMMS, Los Alamos National Laboratory, Condensed Matter and Magnet Sciences, Los Alamos National Laboratory

  • Filip Ronning

    Los Alamos National Laboratory, Los Alamos, NM 87545, USA, Los Alamos National Laboratory, MPA-CMMS, Los Alamos National Laboratory, Los Alamos, USA, MPA-CMMS, Los Alamos National Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico, USA, Los Alamos National Labs