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タイトル: | Stripe antiferromagnetic correlations in LaFeAsO_{1−x}F_{x} probed by ^{75}As NMR |
著者: | Kitagawa, Shunsaku https://orcid.org/0000-0002-1855-4760 (unconfirmed) Nakai, Yusuke Iye, Tetsuya Ishida, Kenji Kamihara, Yoichi Hirano, Masahiro Hosono, Hideo |
著者名の別形: | 北川, 俊作 |
発行日: | Jun-2010 |
出版者: | The American Physical Society |
誌名: | Physical Review B |
巻: | 81 |
号: | 21 |
論文番号: | 212502 |
抄録: | The anisotropy of the nuclear spin-lattice relaxation rate 1/T1 of 75As was investigated in the iron pnictide LaFeAs(O1−xFx) (x=0.07, 0.11, and 0.14) as well as LaFeAsO. While the temperature dependence of the normal-state 1/T1T in the superconducting (SC) x=0.07 is different from that in the SC x=0.11, their anisotropy of 1/T1, R≡(1/T1)H∥ab/(1/T1)H∥c in the normal state is almost the same (≃1.5). The observed anisotropy is ascribable to the presence of the local stripe correlations with Q=(π,0) or (0,π). In contrast, 1/T1 is isotropic and R is approximately 1 in the overdoped x=0.14 sample, where superconductivity is almost suppressed. These results suggest that the presence of the local stripe correlations originating from the nesting between hole and electron Fermi surfaces is linked to high-Tc superconductivity in iron pnictides. |
著作権等: | © 2010 by The American Physical Society |
URI: | http://hdl.handle.net/2433/128955 |
DOI(出版社版): | 10.1103/PhysRevB.81.212502 |
出現コレクション: | 学術雑誌掲載論文等 |
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