Fig. 2: Field evolution of phase transitions and ordering wave vector in CeAuSb₂.

a Temperature dependence of the thermal expansion of CeAuSb₂ along [001] at various magnetic fields applied along the c-axis. Labels in bold indicate H_c1, \(\tilde{H}\), and H_c2. b Temperature dependence of the linear thermal expansion coefficient along [001] with 1 and 5 T applied along the c-axis. The estimated pressure is 0.07 and 0.02 GPa for high-(dashed line) and low-(solid line) strain measurements, respectively. Solid arrows indicate peak positions: blue and magenta arrows for the T_s and T_N, respectively. Dashed arrows indicate points of minor peaks under low and high strains. c Temperature dependence of the in-plane electrical resistivity, ρ_ab, of CeAuSb₂ for applied magnetic fields along c-axis. Data at different fields are shifted for clarity. Arrows indicate antiferromagnetic transition temperatures: black, red, and blue arrows for the T_N1, T_N2, and T_N3, respectively. d–f Temperature derivative of ρ_ab under applied fields as a function of temperature at 5.5 T (d), 3.5 T (e), and 0 T (f). g Magnetic ordering wave vector η[r, l, u. ] for Q₁ = (η, η, 1/2) in CeAuSb₂ as a function of magnetic field applied along the c-axis at 100 mK. Data from ref. ²⁰ were obtained by neutron diffraction measurement. Dashed lines at H_c1, \(\tilde{H}\), and H_c2 separate three distinct regions. Error bars are smaller than the size of the data points.