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Title: Tunable quantum critical point and detached superconductivity in Al-doped CrAs

Abstract

The origin of unconventional superconductivity and its relationship to a T = 0 K quantum critical point (QCP), which is hidden inside the dome of a superconducting state, have long been an outstanding puzzle in strongly correlated superconductors. The observation and tuning of the hidden QCP, which is key to resolving the mystery, however, has been rarely reported. Here we report the controlling of a hidden QCP in the helical antiferromagnet CrAs and separation of the tuned QCP from the pressure-induced superconducting phase. The Al doping in CrAs increases the antiferromagnetic ordering temperature TN from 265 to 275 K, while it suppresses the QCP from 8 to 4.5 kbar. Pressure-induced superconductivity in the high-pressure regime is almost independent of Al doping, but superconductivity below 6 kbar is suppressed, revealing the clear separation between the tuned antiferromagnetic QCP and Tc maximum. These discoveries illustrate subtleties in the interplay between superconductivity and quantum criticality and warrant a deeper insight in understanding of unconventional superconductivity.

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [1]
+ Show Author Affiliations
  1. Sungkyunkwan Univ., Suwon (South Korea). Center for Quantum Materials and Superconductivity (CQMS) & Dept. of Physics
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
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)
OSTI Identifier:
1565886
Report Number(s):
LA-UR-18-22403
Journal ID: ISSN 2397-4648; TRN: US2000927
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
npj Quantum Materials
Additional Journal Information:
Journal Volume: 4; Journal Issue: 1; Journal ID: ISSN 2397-4648
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; High Magnetic Field Science

Citation Formats

Park, Sungmin, Shin, Soohyeon, Kim, Sung-Il, Kim, Suyoung, Park, Chan-Koo, Thompson, Joe D., and Park, Tuson. Tunable quantum critical point and detached superconductivity in Al-doped CrAs. United States: N. p., 2019. Web. doi:10.1038/s41535-019-0188-6.
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Park, Sungmin, Shin, Soohyeon, Kim, Sung-Il, Kim, Suyoung, Park, Chan-Koo, Thompson, Joe D., & Park, Tuson. Tunable quantum critical point and detached superconductivity in Al-doped CrAs. United States. https://doi.org/10.1038/s41535-019-0188-6
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Park, Sungmin, Shin, Soohyeon, Kim, Sung-Il, Kim, Suyoung, Park, Chan-Koo, Thompson, Joe D., and Park, Tuson. Thu . "Tunable quantum critical point and detached superconductivity in Al-doped CrAs". United States. https://doi.org/10.1038/s41535-019-0188-6. https://www.osti.gov/servlets/purl/1565886.
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@article{osti_1565886,
title = {Tunable quantum critical point and detached superconductivity in Al-doped CrAs},
author = {Park, Sungmin and Shin, Soohyeon and Kim, Sung-Il and Kim, Suyoung and Park, Chan-Koo and Thompson, Joe D. and Park, Tuson},
abstractNote = {The origin of unconventional superconductivity and its relationship to a T = 0 K quantum critical point (QCP), which is hidden inside the dome of a superconducting state, have long been an outstanding puzzle in strongly correlated superconductors. The observation and tuning of the hidden QCP, which is key to resolving the mystery, however, has been rarely reported. Here we report the controlling of a hidden QCP in the helical antiferromagnet CrAs and separation of the tuned QCP from the pressure-induced superconducting phase. The Al doping in CrAs increases the antiferromagnetic ordering temperature TN from 265 to 275 K, while it suppresses the QCP from 8 to 4.5 kbar. Pressure-induced superconductivity in the high-pressure regime is almost independent of Al doping, but superconductivity below 6 kbar is suppressed, revealing the clear separation between the tuned antiferromagnetic QCP and Tc maximum. These discoveries illustrate subtleties in the interplay between superconductivity and quantum criticality and warrant a deeper insight in understanding of unconventional superconductivity.},
doi = {10.1038/s41535-019-0188-6},
journal = {npj Quantum Materials},
number = 1,
volume = 4,
place = {United States},
year = {Thu Sep 05 00:00:00 EDT 2019},
month = {Thu Sep 05 00:00:00 EDT 2019}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1038/s41535-019-0188-6
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Cited by: 7 works
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Figures / Tables:

Fig. 1 Fig. 1: Schematic temperature-control parameter (T–$δ$) phase diagram of superconductivity and quantum critical matter. a Unconventional superconductivity is often observed in proximity to a projected quantum critical point ($δ$c), where non-Fermi liquid behavior is observed in the normal state above the SC phase. b When $δ$c is tuned to amore » new point $δ$c', the SC phase can be either moved to the new $δ$c' or remain at the old $δ$c—see the main text for discussion« less
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