75As-nuclear magnetic relaxation on LaFeAsO1-xF x under pressure

N. Fujiwara, K. Tatsumi, T. Nakano, H. Okada, H. Takahashi, Y. Kamihara, M. Hirano, H. Hosono

Research output: Contribution to journalArticlepeer-review

Abstract

75As-nuclear magnetic relaxation rate (1/T1) was measured under pressure in LaFeAsO1-xFx (x = 0.08 and 0.14). For the x = 0.14 doped samples, 1/T1T = constant is observed at ambient pressure just above Tc, and application of pressure enhances the value, similar to the behavior of Tc. 1/T1T = constant originates from the Korringa relation, and an increase in DOS due to pressure application leads to the enhancement of Tc. In the case of x = 0.08, 1/T1T = constant is observed in a wide T range above T c, and the value is enhanced compared to the case of x = 0.14. The enhancement is attributable to antiferromagnetic spin fluctuation rather than an increase in DOS.

Original languageEnglish
Pages (from-to)S347-S348
JournalPhysica C: Superconductivity and its applications
Volume470
Issue numberSUPPL.1
DOIs
Publication statusPublished - 2010 Dec
Externally publishedYes

Keywords

  • High pressure
  • LaFeAsOF
  • NMR

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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