Indication of Ferromagnetic Quantum Critical Point in Kondo Lattice CeRh6Ge4

Hisashi Kotegawa, Eiichi Matsuoka, Toshiaki Uga, Masaki Takemura, Masahiro Manago, Noriyasu Chikuchi, Hitoshi Sugawara, Hideki Tou, Hisatomo Harima
2019 Journal of the Physical Society of Japan  
We report resistivity measurements under pressure for Kondo-lattice ferromagnet CeRh_6Ge_4, and present that a quantum ferromagnetic (FM) phase transition is easily achieved. In most clean metallic ferromagnets, a quantum critical point (QCP) at zero field is avoided by changing the FM transition to a discontinuous transition or to an antiferromagnetic transition. In CeRh_6Ge_4, to the contrary, the Curie temperature of 2.5 K decreases continuously as increasing pressure without any clear
more » ... ure that the transition changes to first order. The obvious non Fermi liquid behavior is observed in the vicinity of the quantum FM phase transition. The experimental data do not contradict a picture in which CeRh_6Ge_4 shows the FM QCP at zero field. Band structure calculation suggests the unusual electronic state of CeRh_6Ge_4 among Ce-based Kondo lattices. CeRh_6Ge_4 deserves further investigations and will be a key material to understand the matter of the FM QCP.
doi:10.7566/jpsj.88.093702 fatcat:o6whjbrtjvax7hry67iiykofwq