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Title: Unconventional and conventional quantum criticalities in CeRh 0.58Ir 0.42In 5

Abstract

An appropriate description of the state of matter that appears as a second order phase transition is tuned toward zero temperature, viz. quantum-critical point (QCP), poses fundamental and still not fully answered questions. Experiments are needed both to test basic conclusions and to guide further refinement of theoretical models. Here, charge and entropy transport properties as well as AC specific heat of the heavy-fermion compound CeRh 0.58Ir 0.42In 5, measured as a function of pressure, reveal two qualitatively different QCPs in a single material driven by a single non-symmetry-breaking tuning parameter. A discontinuous sign-change jump in thermopower suggests an unconventional QCP at p c1 accompanied by an abrupt Fermi-surface reconstruction that is followed by a conventional spin-density-wave critical point at p c2 across which the Fermi surface evolves smoothly to a heavy Fermi-liquid state. These experiments are consistent with some theoretical predictions, including the sequence of critical points and the temperature dependence of the thermopower in their vicinity.

Authors:
 [1];  [2];  [1];  [1]; ORCiD logo [1];  [3];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Zhejiang Univ., Hangzhou (China).
  3. Rice Univ., Houston, TX (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1487365
Report Number(s):
LA-UR-18-31533
Journal ID: ISSN 2397-4648
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
npj Quantum Materials
Additional Journal Information:
Journal Volume: 3; Journal Issue: 1; Journal ID: ISSN 2397-4648
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Material Science

Citation Formats

Luo, Yongkang, Lu, Xin, Dioguardi, Adam P., Rosa, Priscila S. F., Bauer, Eric D., Si, Qimiao, and Thompson, Joe D. Unconventional and conventional quantum criticalities in CeRh0.58Ir0.42In5. United States: N. p., 2018. Web. doi:10.1038/s41535-018-0080-9.
Luo, Yongkang, Lu, Xin, Dioguardi, Adam P., Rosa, Priscila S. F., Bauer, Eric D., Si, Qimiao, & Thompson, Joe D. Unconventional and conventional quantum criticalities in CeRh0.58Ir0.42In5. United States. doi:10.1038/s41535-018-0080-9.
Luo, Yongkang, Lu, Xin, Dioguardi, Adam P., Rosa, Priscila S. F., Bauer, Eric D., Si, Qimiao, and Thompson, Joe D. Thu . "Unconventional and conventional quantum criticalities in CeRh0.58Ir0.42In5". United States. doi:10.1038/s41535-018-0080-9. https://www.osti.gov/servlets/purl/1487365.
@article{osti_1487365,
title = {Unconventional and conventional quantum criticalities in CeRh0.58Ir0.42In5},
author = {Luo, Yongkang and Lu, Xin and Dioguardi, Adam P. and Rosa, Priscila S. F. and Bauer, Eric D. and Si, Qimiao and Thompson, Joe D.},
abstractNote = {An appropriate description of the state of matter that appears as a second order phase transition is tuned toward zero temperature, viz. quantum-critical point (QCP), poses fundamental and still not fully answered questions. Experiments are needed both to test basic conclusions and to guide further refinement of theoretical models. Here, charge and entropy transport properties as well as AC specific heat of the heavy-fermion compound CeRh0.58Ir0.42In5, measured as a function of pressure, reveal two qualitatively different QCPs in a single material driven by a single non-symmetry-breaking tuning parameter. A discontinuous sign-change jump in thermopower suggests an unconventional QCP at pc1 accompanied by an abrupt Fermi-surface reconstruction that is followed by a conventional spin-density-wave critical point at pc2 across which the Fermi surface evolves smoothly to a heavy Fermi-liquid state. These experiments are consistent with some theoretical predictions, including the sequence of critical points and the temperature dependence of the thermopower in their vicinity.},
doi = {10.1038/s41535-018-0080-9},
journal = {npj Quantum Materials},
number = 1,
volume = 3,
place = {United States},
year = {2018},
month = {2}
}

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