Fig. 3: Thermodynamic signatures of Kondo screening.

a, b Temperature dependence of the static magnetic susceptibility χ_c(T) and the pristine-subtracted Δχ_c(T) = χ_c(T) –χ_c(T;x = 0) for α-Ru_1−xCr_xCl₃ (x = 0.01–0.07) in an applied field of B//c = 0.1 T. The solid lines are fittings to logarithmic divergence Δχ(T)~ln(D/T), where D is the band edge energy. c Comparison of the T-dependent magnetic specific heat C_m(T) between α-Ru_1−xCr_xCl₃ (x = 0.04) and the pristine material (x = 0). C_m(T) is obtained by subtracting a lattice contribution from the total specific heat (Supplementary Fig. 12). The solid lines indicate a T-linear dependence of C_m(T). The error bars represent one standard deviation of the three repeated specific-heat measurements. d Normalized magnetic entropy S_m/S_m^theory as a function of temperature evaluated by integrating C_m(T)/T in a semi-log scale. S_m^theory is Rln2 and 0.96Rln2 + 0.04Rln4 for x = 0.00 and 0.04, respectively. The solid and dashed lines denote a fit using three phenomenological functions (“Methods”).