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Title: A peak in the critical current for quantum critical superconductors

Abstract

Generally, studies of the critical current I c are necessary if superconductors are to be of practical use, because Ic sets the current limit below which there is a zero-resistance state. Here, we report a peak in the pressure dependence of the zero-field I c, I c(0), at a hidden quantum critical point (QCP), where a continuous antiferromagnetic transition temperature is suppressed by pressure toward 0 K in CeRhIn 5 and 4.4% Sn-doped CeRhIn 5. The I c(0)s of these Ce-based compounds under pressure exhibit a universal temperature dependence, underlining that the peak in zero-field I c(P) is determined predominantly by critical fluctuations associated with the hidden QCP. The dc conductivity σ dc is a minimum at the QCP, showing anti-correlation with I c(0). These discoveries demonstrate that a quantum critical point hidden inside the superconducting phase in strongly correlated materials can be exposed by the zero-field I c, therefore providing a direct link between a QCP and unconventional superconductivity.

Authors:
ORCiD logo [1];  [1];  [1]; ORCiD logo [2];  [3];  [1]
  1. Sungkyunkwan Univ., Suwon (Republic of Korea)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Zhejiang Univ., Hangzhou (China).
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1463511
Report Number(s):
LA-UR-18-26340
Journal ID: ISSN 2041-1723
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Material Science

Citation Formats

Jung, Soon-Gil, Seo, Soonbeom, Lee, Sangyun, Bauer, Eric D., Lee, Han-Oh, and Park, Tuson. A peak in the critical current for quantum critical superconductors. United States: N. p., 2018. Web. doi:10.1038/s41467-018-02899-5.
Jung, Soon-Gil, Seo, Soonbeom, Lee, Sangyun, Bauer, Eric D., Lee, Han-Oh, & Park, Tuson. A peak in the critical current for quantum critical superconductors. United States. doi:10.1038/s41467-018-02899-5.
Jung, Soon-Gil, Seo, Soonbeom, Lee, Sangyun, Bauer, Eric D., Lee, Han-Oh, and Park, Tuson. Tue . "A peak in the critical current for quantum critical superconductors". United States. doi:10.1038/s41467-018-02899-5. https://www.osti.gov/servlets/purl/1463511.
@article{osti_1463511,
title = {A peak in the critical current for quantum critical superconductors},
author = {Jung, Soon-Gil and Seo, Soonbeom and Lee, Sangyun and Bauer, Eric D. and Lee, Han-Oh and Park, Tuson},
abstractNote = {Generally, studies of the critical current Ic are necessary if superconductors are to be of practical use, because Ic sets the current limit below which there is a zero-resistance state. Here, we report a peak in the pressure dependence of the zero-field Ic, Ic(0), at a hidden quantum critical point (QCP), where a continuous antiferromagnetic transition temperature is suppressed by pressure toward 0 K in CeRhIn5 and 4.4% Sn-doped CeRhIn5. The Ic(0)s of these Ce-based compounds under pressure exhibit a universal temperature dependence, underlining that the peak in zero-field Ic(P) is determined predominantly by critical fluctuations associated with the hidden QCP. The dc conductivity σdc is a minimum at the QCP, showing anti-correlation with Ic(0). These discoveries demonstrate that a quantum critical point hidden inside the superconducting phase in strongly correlated materials can be exposed by the zero-field Ic, therefore providing a direct link between a QCP and unconventional superconductivity.},
doi = {10.1038/s41467-018-02899-5},
journal = {Nature Communications},
number = 1,
volume = 9,
place = {United States},
year = {2018},
month = {1}
}

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