Heavy Fermion Quantum Criticality and Destruction of the Kondo Effect in a Nickel Oxypnictide

Abstract

A quantum critical point arises at a continuous transformation between distinct phases of matter at zero temperature. Studies in antiferromagnetic heavy fermion materials have revealed that quantum criticality has several classes, with an unconventional type that involves a critical destruction of the Kondo entanglement. In order to understand such varieties, it is important to extend the materials basis beyond the usual setting of intermetallic compounds. Here we show that a nickel oxypnictide, CeNiAsO, displays a heavy-fermion antiferromagnetic quantum critical point as a function of either pressure or P/As substitution. At the quantum critical point, non-Fermi liquid behavior appears, which is accompanied by a divergent effective carrier mass. Across the quantum critical point, the low-temperature Hall coefficient undergoes a rapid sign change, suggesting a sudden jump of the Fermi surface and a destruction of the Kondo effect. Our results imply that the enormous materials basis for the oxypnictides, which has been so crucial to the search for high temperature superconductivity, will also play a vital role in the effort to establish the universality classes of quantum criticality in strongly correlated electron systems.

4 figures, Supplementary Information on NPG website

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Cited by in corpus (13)

• Highly-robust reentrant superconductivity in CsV3Sb5 under pressure
• Spin reorientation and Ce-Mn coupling in antiferromagnetic oxypnictide CeMnAsO
• Cesium-involved electron transfer and electron-electron interaction in high-pressure metallic CsPbI3
• Realization of Kondo chain in CeCo${}_2$Ga${}_8$
• Doping evolution of antiferromagnetism and transport properties in the non-superconducting BaFe2-2xNixCrxAs2
• Pseudo-Ising superconductivity induced by $p$-wave magnetism
• Pinball liquid phase from Hund's coupling in frustrated transition metal oxides
• Uniaxial stress effect on the quasi-one-dimensional Kondo lattice CeCo${}_2$Ga${}_8$
• ${}^{75}$As NMR study of the antiferromagnetic Kondo lattice compound CeNiAsO
• Abnormal planar Hall effect and disentanglement of incoherent and coherent transport in a Kondo lattice
• Rich unconventional Hall effects in a single quasi-kagome Kondo Weyl semimetal candidate Ce${}_3$TiSb${}_5$
• Synthesis and physical properties of Ce${}_2$Rh${}_{3+\delta }$Sb${}_4$ single crystals
• Sub-spin-flop switching of a fully compensated antiferromagnet by magnetic field