Systematic A 75 s NMR study of the dependence of low-lying excitations on F doping in the iron oxypnictide LaFeAsO1-x Fx

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

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

We report A 75 s NMR studies on LaFeAs (O1-x Fx) (0≤x≤0.14). At x=0.04 near the phase boundary, from resistivity, spin-lattice relaxation rate 1/ T1, and NMR spectrum measurements, we found weak magnetic order at TN □30 K. Antiferromagnetic (AFM) fluctuations proved through 1/ T1 are suppressed significantly with F doping, and pseudogap behavior without pronounced AFM fluctuations is observed at x=0.11 where TC is maximum. This significant suppression of 1/ T1 T upon F doping while TC remains nearly unchanged suggests that low-energy AFM fluctuations probed with A 75 s NMR do not play a crucial role in the superconductivity.

Original languageEnglish
Article number212506
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number21
DOIs
Publication statusPublished - 2009 Jun 11
Externally publishedYes

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Iron
Doping (additives)
Nuclear magnetic resonance
iron
nuclear magnetic resonance
excitation
Spin-lattice relaxation
Phase boundaries
Superconductivity
spin-lattice relaxation
superconductivity
retarding
electrical resistivity
energy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Systematic A 75 s NMR study of the dependence of low-lying excitations on F doping in the iron oxypnictide LaFeAsO1-x Fx. / Nakai, Yusuke; Kitagawa, Shunsaku; Ishida, Kenji; Kamihara, Yoichi; Hirano, Masahiro; Hosono, Hideo.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 79, No. 21, 212506, 11.06.2009.

Research output: Contribution to journalArticle

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