Fig. 3: Field-tuned Kondo insulator to heavy fermion metal transition in Ce3Bi4Pd3.
From: Control of electronic topology in a strongly correlated electron system
a Magnetic torque isotherms of Ce3Bi4Pd3 at various temperatures as function of applied magnetic field up to 37 T and, for low temperatures, up to 65 T. b Same as in (a) for the Kondo insulator Ce3Bi4Pt3. c Field derivative of the magnetic torque isotherms of Ce3Bi4Pd3 and Ce3Bi4Pt3 at the lowest temperatures, revealing similar characteristics, albeit at different fields (the fields where the step-like increases reach half height are indicated by arrows). d Second field derivative of the torque signal of Ce3Bi4Pd3. We define the characteristic field Bτ of the torque signal as the center of the width at half maximum, as indicated by the dashed vertical line and the horizontal arrows for the 0.35 K isotherm. e Electrical resistivity of Ce3Bi4Pd3 at 15 T, displaying linear-in-T2 Fermi liquid behavior from the lowest temperature of 0.1 K up to TFL (bottom and left axes, red line; above TFL, the data deviate by more than 5% from the Fermi liquid form ρ = ρ0 + AT2) and linear-in-T non-Fermi liquid behavior from somewhat above TFL up to TNFL (top and right axes, orange line; see Supplementary Note 11 for details). f Fermi liquid A coefficient vs applied magnetic field. The data above 16 T are well described by \(A\propto {(B-{B}_{{{{{{{{\rm{c2}}}}}}}}})}^{-p}\) with Bc2 = 13.8 T and p ≈ 1. Deviations at lower fields are attributed to proximity to the Kondo insulating phase (see Supplementary Note 11 and Supplementary Fig. 11).
