Ce-Site Dilution in the Ferromagnetic Kondo Lattice CeRh$_6$Ge$_4$
Jia-Cheng Xu1, Hang Su1, Rohit Kumar1, Shuai-Shuai Luo1, Zhi-Yong Nie1, An Wang1, Feng Du1, Rui Li1, Michael Smidman1,2, and Hui-Qiu Yuan1,2,3*
1Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, China 2Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics, Zhejiang University, Hangzhou 310058, China 3State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310058, China
Abstract：The heavy fermion ferromagnet CeRh$_6$Ge$_4$ is the first example of a clean stoichiometric system where the ferromagnetic transition can be continuously suppressed by hydrostatic pressure to a quantum critical point. In order to reveal the outcome when the magnetic lattice of CeRh$_6$Ge$_4$ is diluted with non-magnetic atoms, this study reports comprehensive measurements of the physical properties of both single crystal and polycrystalline samples of La$_x$Ce$_{1-x}$Rh$_6$Ge$_4$. With increasing $x$, the Curie temperature decreases, and no transition is observed for $x > 0.25$, while the system evolves from exhibiting coherent Kondo lattice behaviors at low $x$ to the Kondo impurity scenario at large $x$. Moreover, non-Fermi liquid behavior is observed over a wide doping range, which agrees well with the disordered Kondo model for $0.52 \leq x \leq 0.66$, while strange metal behavior is revealed in the vicinity of $x_{\rm c} = 0.26$.
. [J]. 中国物理快报, 2021, 38(8): 87101-.
Jia-Cheng Xu, Hang Su, Rohit Kumar, Shuai-Shuai Luo, Zhi-Yong Nie, An Wang, Feng Du, Rui Li, Michael Smidman, and Hui-Qiu Yuan. Ce-Site Dilution in the Ferromagnetic Kondo Lattice CeRh$_6$Ge$_4$. Chin. Phys. Lett., 2021, 38(8): 87101-.
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2021, Vol. 38 
