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Title: Pressure-tuned quantum criticality in the antiferromagnetic Kondo semimetal CeNi 2–δAs 2

Abstract

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–δAs 2 (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–δAs 2 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.

Authors:
 [1];  [1];  [1];  [2];  [3];  [2];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Zhejiang Univ., Hangzhou (China)
  3. Sungkyunkwan Univ., Suwon (South Korea)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1246337
Report Number(s):
LA-UR-14-26358
Journal ID: ISSN 0027-8424
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 112; Journal Issue: 44; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; Kondo effect; quantum criticality; heavy Fermion; Nozieres exhaustion; anomalous Hall effect

Citation Formats

Luo, Yongkang, Ronning, F., Wakeham, N., Lu, Xin, Park, Tuson, Xu, Z. -A., and Thompson, J. D. Pressure-tuned quantum criticality in the antiferromagnetic Kondo semimetal CeNi2–δAs2. United States: N. p., 2015. Web. doi:10.1073/pnas.1509581112.
Luo, Yongkang, Ronning, F., Wakeham, N., Lu, Xin, Park, Tuson, Xu, Z. -A., & Thompson, J. D. Pressure-tuned quantum criticality in the antiferromagnetic Kondo semimetal CeNi2–δAs2. United States. doi:10.1073/pnas.1509581112.
Luo, Yongkang, Ronning, F., Wakeham, N., Lu, Xin, Park, Tuson, Xu, Z. -A., and Thompson, J. D. Mon . "Pressure-tuned quantum criticality in the antiferromagnetic Kondo semimetal CeNi2–δAs2". United States. doi:10.1073/pnas.1509581112. https://www.osti.gov/servlets/purl/1246337.
@article{osti_1246337,
title = {Pressure-tuned quantum criticality in the antiferromagnetic Kondo semimetal CeNi2–δAs2},
author = {Luo, Yongkang and Ronning, F. and Wakeham, N. and Lu, Xin and Park, Tuson and Xu, Z. -A. and Thompson, J. D.},
abstractNote = {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 CeNi2–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 CeNi2–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.},
doi = {10.1073/pnas.1509581112},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 44,
volume = 112,
place = {United States},
year = {2015},
month = {10}
}

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