Thermal expansion measurements of heavy-fermion CeAuSb<sub>2</sub>

ORAL

Abstract

CeAuSb2 is a heavy-fermion antiferromagnet hosting two field-induced transitions at Hc1 ~ 2.8 T and Hc2 ~ 5.6 T when field is applied along the c-axis [1, 2]. At Hc1, the magnetic structure changes from a single-q to a multi-q spin density wave [3]. Here we report the temperature dependence of the resistivity (ρ) and thermal expansion (ΔL/L) of CeAuSb2 when H||c-axis. Our results show that ρ and ΔL/L display signatures of the different magnetic structures, and are susceptible to the critical end point. We will discuss both pressure and field effects on the multiple phase transitions in the three-dimensional phase diagram of CeAuSb2.

[1] L. Balicas et al., “Magnetic field-tuned quantum critical point in CeAuSb2” Phys. Rev. B 72, 064422 (2005).
[2] L. Zhao et al., “Field-temperature phase diagram and entropy landscape of CeAuSb2” Phys. Rev. B 93, 195124 (2016).
[3] G. G. Marcus et al., “Multi-Q mesoscale magnetism in CeAuSb2” Phys. Rev. Lett. 120, 097201 (2018).

*Work at Los Alamos was performed under the auspices of the US DOE, Division of Materials Sciences and Engineering. S. S. acknowledges support of the LANL LDRD program through a Director's Postdoctoral Fellowship.

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Presenters

  • Soonbeom Seo

    • Los Alamos National Laboratory

Authors

  • Soonbeom Seo

    • Los Alamos National Laboratory

  • Sean Thomas

    • 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

  • 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

  • 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

  • Priscila Rosa

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