Indication of Ferromagnetic Quantum Critical Point in Kondo Lattice CeRh\(_6\)Ge\(_4\)

We report resistivity measurements under pressure for Kondo-lattice ferromagnet CeRh\(_6\)Ge\(_4\), 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 trans...

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Published in:arXiv.org 2019-08
Main Authors: Kotegawa, Hisashi, Matsuoka, Eiichi, Uga, Toshiaki, Takemura, Masaki, Manago, Masahiro, Chikuchi, Noriyasu, Sugawara, Hitoshi, Tou, Hideki, Harima, Hisatomo
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Antiferromagnetism
Critical point
Curie temperature
Electron states
Fermi liquids
Ferromagnetism
Lattices
Phase transitions
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creator Kotegawa, Hisashi
Matsuoka, Eiichi
Uga, Toshiaki
Takemura, Masaki
Manago, Masahiro
Chikuchi, Noriyasu
Sugawara, Hitoshi
Tou, Hideki
Harima, Hisatomo
description We report resistivity measurements under pressure for Kondo-lattice ferromagnet CeRh\(_6\)Ge\(_4\), 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\(_6\)Ge\(_4\), to the contrary, the Curie temperature of 2.5 K decreases continuously as increasing pressure without any clear signature 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\(_6\)Ge\(_4\) shows the FM QCP at zero field. Band structure calculation suggests the unusual electronic state of CeRh\(_6\)Ge\(_4\) among Ce-based Kondo lattices. CeRh\(_6\)Ge\(_4\) deserves further investigations and will be a key material to understand the matter of the FM QCP.
doi_str_mv 10.48550/arxiv.1907.09802
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subjects Antiferromagnetism
Critical point
Curie temperature
Electron states
Fermi liquids
Ferromagnetism
Lattices
Phase transitions
title Indication of Ferromagnetic Quantum Critical Point in Kondo Lattice CeRh\(_6\)Ge\(_4\)
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