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タイトル: | Quantum Phase transition under pressure in a heavily hydrogen-doped iron-based superconductor LaFeAsO |
著者: | Fujiwara, Naoki https://orcid.org/0000-0003-2858-6878 (unconfirmed) Kawaguchi, Naoto IImura, Soushi Matsuishi, Satoru Hosono, Hideo |
著者名の別形: | 藤原, 直樹 河口, 尚登 |
発行日: | 1-Oct-2017 |
出版者: | American Physical Society (APS) |
誌名: | Physical Review B |
巻: | 96 |
号: | 14 |
論文番号: | 140507(R) |
抄録: | Hydrogen (H)-doped LaFeAsO is a prototypical iron-based superconductor. However, its phase diagram extends beyond the standard framework, where a superconducting (SC) phase follows an antiferromagnetic (AF) phase upon carrier doping; instead, the SC phase is sandwiched between two AF phases appearing in lightly and heavily H-doped regimes. We performed nuclear magnetic resonance (NMR) measurements under pressure, focusing on the second AF phase in the heavily H-doped regime. The second AF phase is strongly suppressed when a pressure of 3.0 GPa is applied, and apparently shifts to a highly H-doped regime, thereby a “bare” quantum critical point (QCP) emerges. A quantum critical regime emerges in a paramagnetic state near the QCP, however, the influence of the AF critical fluctuations to the SC phase is limited in the narrow doping regime near the QCP. The optimal SC condition (Tc∼48K) is unaffected by AF fluctuations. |
著作権等: | © 2017 American Physical Society |
URI: | http://hdl.handle.net/2433/241713 |
DOI(出版社版): | 10.1103/PhysRevB.96.140507 |
出現コレクション: | 学術雑誌掲載論文等 |
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