We have investigated the doping-induced variation of magnetic and charge transport properties of single crystalline $\mathrm{Ce}{\mathrm{Co}}_{1-x}{\mathrm{Fe}}_x{\mathrm{Ge}}_3$ with a noncentrosymmetric tetragonal $\mathrm{Ba}\mathrm{Ni}{\mathrm{Sn}}_3$-type structure. The magnetization measurements revealed that, with increasing doping level $x$, the antiferromagnetic phase for $x=0$ turns into a ferromagnetic one at $x=0.15$, a cluster-glass-like phase at $x=0.46$, and eventually evolves into a paramagnetic phase above $x=0.67$. For $0\le x<0.46$ wherein the electrical resistivity shows the Fermi liquid behavior, the coefficient of the $T^2$-term of resistivity is small for $0\le x\le 0.33$ but increases sharply at around $x\sim 0.42$, indicating the enhancement of density of state near the Fermi energy. Hall resistivity measurements indicate that, at 2 K in the ferromagnetic phase, the anomalous Hall conductivity remains nearly constant over the range $0.15\le x\le 0.42$ but markedly decreases with increasing $x$ beyond 0.42. Notably, an anomalous Hall component that is not proportional to magnetization is observed for $x\ge 0.42$. It is anticipated that the Berry curvature in momentum space significantly changes across the transition from the ferromagnetic phase to cluster-glass-like phase, driven by a change in the Kondo hybridization in the present materials.

Close

PrevNext

View figure in article

• Magnetotransport
• Heavy-fermion systems
• Topological materials
• Magnetization measurements
• Resistivity measurements