75As NMR study of the growth of paramagnetic-metal domains due to electron doping near the superconducting phase in LaFeAsO 1-xF x

N. Fujiwara, T. Nakano, Yoichi Kamihara, H. Hosono

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We studied the electric and magnetic behavior near the phase boundary between antiferromagnetic (AF) and superconducting phases for a prototype of high-T c pnictides LaFeAsO 1-xF x by using nuclear magnetic resonance, and found that paramagnetic-metal (PM) domains segregate from AF domains. PM domains grow in size with increasing electron doping level and are accompanied by the onset of superconductivity, and thus the application of pressure or increasing the doping level causes superconductivity. The existence of PM domains cannot be explained by the existing paradigm that focuses only on the relationship between superconductivity and antiferromagnetism. Based on orbital fluctuation theory, the existence of PM domains is evidence of the ferroquadrupole state.

Original languageEnglish
Article number094501
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number9
DOIs
Publication statusPublished - 2012 Mar 2

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Superconductivity
Metals
Doping (additives)
Nuclear magnetic resonance
nuclear magnetic resonance
Electrons
superconductivity
metals
electrons
Antiferromagnetism
Phase boundaries
fluctuation theory
Group 5A compounds
antiferromagnetism
prototypes
orbitals
causes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

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AU - Nakano, T.

AU - Kamihara, Yoichi

AU - Hosono, H.

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