Fig. 2: Magnetotransport properties of PdCrO2 above TN.
a, b Magnetic field dependent Hall resistivity ρyx(H) up to H = 17.5 T at different temperatures. Below TN, ρyx(H) shows a clear hump at H ~ 5 T (a), which disappears at T ~ 25 K, recovering the linear field dependence from a single Fermi surface (FS) (dashed line). Above TN, ρyx(H) changes from the concave to convex behaviors, manifested by opposite deviation from the low-field linear behavior (dot lines) at T = 45 and 260 K. c Deviation of ρyx(H) from the conventional Hall effect (solid line), determined by the ordinary Hall (\({\rho }_{xy}^{{{{{{{{\rm{O}}}}}}}}}(H)\)) and the conventional anomalous Hall (\({\rho }_{yx}^{{{{{{{{\rm{A}}}}}}}}}(H)\)) contributions. The resulting unconventional anomalous Hall resistivity (\({\rho }_{yx}^{{{{{{{{\rm{T}}}}}}}}}(H)\)) is indicated by the shaded area. d The modified Kohler’s plot of Δρxx(H)/ρxx(0) as a function of the Hall angle, \(\tan {\theta }_{H}\). Strong violation from the scaling behavior is observed below ~75 K. e Contour plot of dρyx/dH(H, T) at different magnetic fields and temperatures. The region of the lower dρyx/dH(H, T) is located at lower fields (violet) just above TN, while the opposite behavior is observed with a V-shape feature at high temperatures. f Temperature-dependent dρyx/dH at different magnetic fields. Below T ~ 25 K, the high field value of dρyx/dH matches well with the calculated Hall coefficient of PdCrO2, extracted from quantum oscillations. Non-monotonous temperature dependence of dρyx/dH becomes saturated at high temperatures T ~ 150 K.
