Stripe antiferromagnetic correlations in LaFeAsO1-x Fx probed by A 75 s NMR

Shunsaku Kitagawa, Yusuke Nakai, Tetsuya Iye, Kenji Ishida, Yoichi Kamihara, Masahiro Hirano, Hideo Hosono

Research output: Contribution to journalArticle

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Abstract

The anisotropy of the nuclear spin-lattice relaxation rate 1/T1 of A 75 As was investigated in the iron pnictide LaFeAs (O 1-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.

Original languageEnglish
Article number212502
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number21
DOIs
Publication statusPublished - 2010 Jun 3
Externally publishedYes

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Anisotropy
Group 5A compounds
Nuclear magnetic resonance
Superconductivity
nuclear magnetic resonance
anisotropy
superconductivity
Iron
iron
Spin-lattice relaxation
Fermi surface
spin-lattice relaxation
nuclear spin
Fermi surfaces
temperature dependence
Electrons
electrons
Temperature

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Stripe antiferromagnetic correlations in LaFeAsO1-x Fx probed by A 75 s NMR. / Kitagawa, Shunsaku; Nakai, Yusuke; Iye, Tetsuya; Ishida, Kenji; Kamihara, Yoichi; Hirano, Masahiro; Hosono, Hideo.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 81, No. 21, 212502, 03.06.2010.

Research output: Contribution to journalArticle

Kitagawa, Shunsaku ; Nakai, Yusuke ; Iye, Tetsuya ; Ishida, Kenji ; Kamihara, Yoichi ; Hirano, Masahiro ; Hosono, Hideo. / Stripe antiferromagnetic correlations in LaFeAsO1-x Fx probed by A 75 s NMR. In: Physical Review B - Condensed Matter and Materials Physics. 2010 ; Vol. 81, No. 21.
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