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CeAuSb₂ is a heavy-fermion antiferromagnet hosting two field-induced transitions at H_c1 ~ 2.8 T and H_c2 ~ 5.6 T when field is applied along the c-axis [1, 2]. At H_c1, 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).