Pressure-tuned quantum criticality in the antiferromagnetic Kondo semimetal CeNi2–δAs2

Luo, Yongkang; Ronning, F.; Wakeham, N.; Lu, Xin; Park, Tuson; Xu, Z. -A.; Thompson, J. D.

doi:10.1073/pnas.1509581112

Title: Pressure-tuned quantum criticality in the antiferromagnetic Kondo semimetal CeNi_2–δAs₂

Journal Article · Mon Oct 19 00:00:00 EDT 2015 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1509581112· OSTI ID:1246337

Luo, Yongkang ^[1]; Ronning, F. ^[1]; Wakeham, N. ^[1]; Lu, Xin ^[2]; Park, Tuson ^[3]; Xu, Z. -A. ^[2]; Thompson, J. D. ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Zhejiang Univ., Hangzhou (China)
Sungkyunkwan Univ., Suwon (South Korea)

The easily tuned balance among competing interactions in Kondo-lattice metals allows access to a zero-temperature, continuous transition between magnetically ordered and disordered phases, a quantum-critical point (QCP). Indeed, these highly correlated electron materials are prototypes for discovering and exploring quantum-critical states. Theoretical models proposed to account for the strange thermodynamic and electrical transport properties that emerge around the QCP of a Kondo lattice assume the presence of an indefinitely large number of itinerant charge carriers. Here, we report a systematic transport and thermodynamic investigation of the Kondo-lattice system CeNi_2–δAs₂ (δ ≈ 0.28) as its antiferromagnetic order is tuned by pressure and magnetic field to zero-temperature boundaries. These experiments show that the very small but finite carrier density of ~0.032 e^–/formular unit in CeNi_2–δAs₂ leads to unexpected transport signatures of quantum criticality and the delayed development of a fully coherent Kondo-lattice state with decreasing temperature. Here, the small carrier density and associated semimetallicity of this Kondo-lattice material favor an unconventional, local-moment type of quantum criticality and raises the specter of the Nozières exhaustion idea that an insufficient number of conduction-electron spins to separately screen local moments requires collective Kondo screening.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1246337

Report Number(s):: LA-UR-14-26358

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Vol. 112, Issue 44; ISSN 0027-8424

Publisher:: National Academy of Sciences, Washington, DC (United States)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 32 works

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References (33)

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Heavy fermion quantum criticality at dilute carrier limit in CeNi2−δ(As1−xPx)2 Chen, Jian; Wang, Zhen; Li, Yupeng Scientific Reports, Vol. 9, Issue 1 https://doi.org/10.1038/s41598-019-48662-8	journal	August 2019
Clamp cell with in situ pressure monitoring for low-temperature neutron scattering measurements Podlesnyak, A.; Loguillo, M.; Rucker, G. M. High Pressure Research, Vol. 38, Issue 4 https://doi.org/10.1080/08957959.2018.1519560	journal	August 2018
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Weyl–Kondo semimetal in heavy-fermion systems Lai, Hsin-Hua; Grefe, Sarah E.; Paschen, Silke Proceedings of the National Academy of Sciences, Vol. 115, Issue 1 https://doi.org/10.1073/pnas.1715851115	journal	December 2017
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Kondo Insulator to Semimetal Transformation Tuned by Spin-Orbit Coupling Dzsaber, S.; Prochaska, L.; Sidorenko, A. arXiv https://doi.org/10.48550/arxiv.1612.03972	text	January 2016
Clamp cell with $in$ $situ$ pressure monitoring for low-temperature neutron scattering measurements Podlesnyak, A.; Loguillo, M.; Rucker, G. M. arXiv https://doi.org/10.48550/arxiv.1904.11529	text	January 2019
PrBi: Topology meets quadrupolar degrees of freedom He, Xiaobo; Zhao, Chuanwen; Yang, Haiyang arXiv https://doi.org/10.48550/arxiv.1909.04446	text	January 2019
Weyl-Kondo Semimetal in Heavy Fermion Systems Lai, Hsin-Hua; Grefe, Sarah E.; Paschen, Silke arXiv https://doi.org/10.48550/arxiv.1612.03899	text	January 2016

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Title: Pressure-tuned quantum criticality in the antiferromagnetic Kondo semimetal CeNi2–δAs2

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Title: Pressure-tuned quantum criticality in the antiferromagnetic Kondo semimetal CeNi_2–δAs₂