ID | 60705 |
フルテキストURL | |
著者 |
Kawasaki, Shinji
Department of Physics, Okayama University
Oka, Toshihide
Department of Physics, Okayama University
Sorime, Akira
Department of Physics, Okayama University
Kogame, Yuji
Department of Physics, Okayama University
Uemoto, Kazuhiro
Department of Physics, Okayama University
Guo, Jing
Institute of Physics, Chinese Academy of Sciences, Beijing National Laboratory for Condensed Matter Physics
Cai, Shu
Institute of Physics, Chinese Academy of Sciences, Beijing National Laboratory for Condensed Matter Physics
Sun, Liling
Institute of Physics, Chinese Academy of Sciences, Beijing National Laboratory for Condensed Matter Physics
Sarrao, John L.
Los Alamos National Laboratory
Thompson, Joe D.
Los Alamos National Laboratory
Zheng, Guo-Qing
Department of Physics, Okayama University
|
抄録 | 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 T-c. (P)-dependent In-115 nuclear quadrupole resonance (NQR) measurements on heavy-fermion antiferromagnet CeRh0.5Ir0.5In5. These experiments reveal an antiferromagnetic (AF) QCP at P-c(AF) = 1.2 GPa where a dome of superconductivity reaches a maximum transition temperature Tc. Preceding P-c(AF), however, the NQR frequency nu(Q) undergoes an abrupt increase at P-c* = 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-c(AF) where T-c is optimized, there is an unusually large fraction of gapless excitations well below T-c that implicates spin-singlet, odd-frequency pairing symmetry.
|
キーワード | Condensed-matter physics
Phase transitions and critical phenomena
Superconducting properties and materials
|
発行日 | 2020-08-27
|
出版物タイトル |
Communications Physics
|
巻 | 3巻
|
号 | 1号
|
出版者 | Nature
|
開始ページ | 148
|
ISSN | 2399-3650
|
資料タイプ |
学術雑誌論文
|
言語 |
英語
|
OAI-PMH Set |
岡山大学
|
著作権者 | © The Author(s) 2020
|
論文のバージョン | publisher
|
DOI | |
Web of Science KeyUT | |
関連URL | isVersionOf https://doi.org/10.1038/s42005-020-00418-x
|
ライセンス | http://creativecommons.org/licenses/by/4.0/
|
助成機関名 |
文部科学省
|
助成番号 | JP19K03747
JP23102717
JP25400374
|