NMR study under pressure on the La1111 pnictides, LaFeAsO 1-x F x

N. Fujiwara, T. Nakano, H. Okada, H. Takahashi, Yoichi Kamihara, M. Hirano, H. Hosono

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Abstract

The relationship between antiferromagnetic (AF) fluctuation and superconductivity was investigated in the La1111 series, LaFeAsO 1-x F x (x=0.05, 0.08, and 0.14) by examining nuclear relaxation rates (1/T 1) at both ambient pressure and 3.0 GPa. Although the AF fluctuation is enhanced by applying pressure in the underdoped regime (x=0.05, and 0.08), the increase in critical transition temperature (T c) is small, whereas T c increases remarkably in the overdoped regime (x=0.14) where the AF fluctuation is absent, suggesting that high T c above 40 K originates not from the AF fluctuation but from the density of states at the electron pocket.

Original languageEnglish
Pages (from-to)1145-1148
Number of pages4
JournalJournal of Superconductivity and Novel Magnetism
Volume24
Issue number3
DOIs
Publication statusPublished - 2011 Apr

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Keywords

  • High pressure
  • La 1111 series
  • NMR

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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