75As-NMR studies on LaFeAsO 1-xF x (x = 0:14) under a pressure of 3 GPa

Kenichiro Tatsumi, Naoki Fujiwara, Hironari Okada, Hiroki Takahashi, Yoichi Kamihara, Masahiro Hirano, Hideo Hosono

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Abstract

75As-nuclear magnetic resonance (NMR) on an iron (Fe)-based superconductor LaFeAsO 1-xF x (x = 0:14) was performed under a pressure of 3 GPa. Enhancement of the superconducting transition temperature (T c) was confirmed from the relaxation rate (1=T 1); T c goes up to 40K by applying pressure up to 3 GPa. 1=T 1T, which is temperature independent just above T c and gives a measure of the density of states (DOS) at the Fermi energy, enhances by applying pressure. These facts suggest that an increase of the DOS leads to the enhancement of T c. On the other hand, anomalous behavior of 1=T 1T observed at high temperatures is suppressed by applying pressure.

Original languageEnglish
Article number023709
JournalJournal of the Physical Society of Japan
Volume78
Issue number2
DOIs
Publication statusPublished - 2009 Feb 1

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Keywords

  • High pressure
  • Iron-based superconductor
  • NMR

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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