Magnetic fluctuations and superconductivity in LaFeAsO1-xF x under pressure as seen via 75As NMR

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

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The relationship between antiferromagnetic (AF) fluctuation and superconductivity was investigated in the La1111 series, LaFeAsO1-x Fx (x=0, 0.05, 0.08, 0.10, and 0.14) by examining nuclear relaxation rates (1/ T1) at both ambient pressure and 3.0 GPa. The results show that the critical doping level at which low-frequency AF fluctuation vanishes is around the optimally doped regime (x∼0.10). Although the AF fluctuation is enhanced by applying pressure in the underdoped regime (0.05≤x<0.10), the increase in critical transition temperature (Tc) is small, whereas Tc remarkably increases in the overdoped regime (x=0.14), implying that the AF fluctuation is less important to the high- Tc mechanism than the density of states at the electron pocket. The x dependence of T c at 3.0 GPa is similar to that of R1111 (R=Ce, Pr, Nd, etc.) with Tc ≥40 K at ambient pressure. The relationship between T c and the pnictogen height or lattice constant indicates that pressure application is equivalent to full rare-earth substitution. This equivalence suggests that high Tc above 40 K is realized when the AF fluctuation is absent.

Original languageEnglish
Article number172502
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number17
DOIs
Publication statusPublished - 2010 Nov 4

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Superconductivity
superconductivity
Nuclear magnetic resonance
nuclear magnetic resonance
nuclear relaxation
Rare earths
Superconducting transition temperature
Lattice constants
Substitution reactions
Doping (additives)
equivalence
critical temperature
rare earth elements
transition temperature
Electrons
substitutes
low frequencies
electrons

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Magnetic fluctuations and superconductivity in LaFeAsO1-xF x under pressure as seen via 75As NMR. / Nakano, T.; Fujiwara, N.; Kamihara, Yoichi; Hirano, M.; Hosono, H.; Okada, H.; Takahashi, H.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 82, No. 17, 172502, 04.11.2010.

Research output: Contribution to journalArticle

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