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Title: Localized-to-itinerant transition preceding antiferromagnetic quantum critical point and gapless superconductivity in CeRh0.5Ir0.5In5

Abstract

A fundamental problem posed from the study of correlated electron compounds, of which heavy-fermion systems are prototypes, is the need to understand the physics of states near a quantum critical point (QCP). At a QCP, magnetic order is suppressed continuously to zero temperature and unconventional superconductivity often appears. Here, we report pressure (P)-dependent 115In nuclear quadrupole resonance (NQR) measurements on heavy-fermion antiferromagnet CeRh0.5Ir0.5In5. These experiments reveal an antiferromagnetic (AF) QCP at \({P}_{{\rm{c}}}^{{\rm{AF}}}=1.2\) GPa where a dome of superconductivity reaches a maximum transition temperature Tc. Preceding \({P}_{{\rm{c}}}^{{\rm{AF}}}\), however, the NQR frequency νQ undergoes an abrupt increase at \({P}_{{\rm{c}}}^{{\rm{* }}}\) = 0.8 GPa in the zero-temperature limit, indicating a change from localized to itinerant character of cerium’s f-electron and associated small-to-large change in the Fermi surface. At \({P}_{{\rm{c}}}^{{\rm{AF}}}\) where Tc is optimized, there is an unusually large fraction of gapless excitations well below Tc that implicates spin-singlet, odd-frequency pairing symmetry.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [2];  [2];  [2];  [3]; ORCiD logo [3];  [4]
  1. Okayama Univ. (Japan)
  2. Chinese Academy of Sciences (CAS), Beijing (China)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Okayama Univ. (Japan); Chinese Academy of Sciences (CAS), Beijing (China)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); Ministry of Education, Culture, Sports, Science and Technology (MEXT); National Natural Science Foundation of China (NNSFC); Ministry of Science and Technology of the People’s Republic of China (MOST); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
OSTI Identifier:
1660597
Report Number(s):
LA-UR-19-30144
Journal ID: ISSN 2399-3650
Grant/Contract Number:  
89233218CNA000001; JP19K03747; JP23102717; JP25400374; 11634015; 2016YFA0300300; 2017YFA0302904; 2017YFA0303103
Resource Type:
Accepted Manuscript
Journal Name:
Communications Physics
Additional Journal Information:
Journal Volume: 3; Journal Issue: 1; Journal ID: ISSN 2399-3650
Publisher:
Springer Nature
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Condensed-matter physics; Phase transitions and critical phenomena; Superconducting properties and materials

Citation Formats

Kawasaki, Shinji, Oka, Toshihide, Sorime, Akira, Kogame, Yuji, Uemoto, Kazuhiro, Matano, Kazuaki, Guo, Jing, Cai, Shu, Sun, Liling, Sarrao, John Louis, Thompson, Joe David, and Zheng, Guo-qing. Localized-to-itinerant transition preceding antiferromagnetic quantum critical point and gapless superconductivity in CeRh0.5Ir0.5In5. United States: N. p., 2020. Web. doi:10.1038/s42005-020-00418-x.
Kawasaki, Shinji, Oka, Toshihide, Sorime, Akira, Kogame, Yuji, Uemoto, Kazuhiro, Matano, Kazuaki, Guo, Jing, Cai, Shu, Sun, Liling, Sarrao, John Louis, Thompson, Joe David, & Zheng, Guo-qing. Localized-to-itinerant transition preceding antiferromagnetic quantum critical point and gapless superconductivity in CeRh0.5Ir0.5In5. United States. doi:10.1038/s42005-020-00418-x.
Kawasaki, Shinji, Oka, Toshihide, Sorime, Akira, Kogame, Yuji, Uemoto, Kazuhiro, Matano, Kazuaki, Guo, Jing, Cai, Shu, Sun, Liling, Sarrao, John Louis, Thompson, Joe David, and Zheng, Guo-qing. Thu . "Localized-to-itinerant transition preceding antiferromagnetic quantum critical point and gapless superconductivity in CeRh0.5Ir0.5In5". United States. doi:10.1038/s42005-020-00418-x. https://www.osti.gov/servlets/purl/1660597.
@article{osti_1660597,
title = {Localized-to-itinerant transition preceding antiferromagnetic quantum critical point and gapless superconductivity in CeRh0.5Ir0.5In5},
author = {Kawasaki, Shinji and Oka, Toshihide and Sorime, Akira and Kogame, Yuji and Uemoto, Kazuhiro and Matano, Kazuaki and Guo, Jing and Cai, Shu and Sun, Liling and Sarrao, John Louis and Thompson, Joe David and Zheng, Guo-qing},
abstractNote = {A fundamental problem posed from the study of correlated electron compounds, of which heavy-fermion systems are prototypes, is the need to understand the physics of states near a quantum critical point (QCP). At a QCP, magnetic order is suppressed continuously to zero temperature and unconventional superconductivity often appears. Here, we report pressure (P)-dependent 115In nuclear quadrupole resonance (NQR) measurements on heavy-fermion antiferromagnet CeRh0.5Ir0.5In5. These experiments reveal an antiferromagnetic (AF) QCP at \({P}_{{\rm{c}}}^{{\rm{AF}}}=1.2\) GPa where a dome of superconductivity reaches a maximum transition temperature Tc. Preceding \({P}_{{\rm{c}}}^{{\rm{AF}}}\), however, the NQR frequency νQ undergoes an abrupt increase at \({P}_{{\rm{c}}}^{{\rm{* }}}\) = 0.8 GPa in the zero-temperature limit, indicating a change from localized to itinerant character of cerium’s f-electron and associated small-to-large change in the Fermi surface. At \({P}_{{\rm{c}}}^{{\rm{AF}}}\) where Tc is optimized, there is an unusually large fraction of gapless excitations well below Tc that implicates spin-singlet, odd-frequency pairing symmetry.},
doi = {10.1038/s42005-020-00418-x},
journal = {Communications Physics},
number = 1,
volume = 3,
place = {United States},
year = {2020},
month = {8}
}

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