### Abstract

Nuclear magnetic resonance (NMR) on an iron (Fe)-based superconductor LaFeAsO_{1-x}F_{x} (x = 0.08 and 0.14) was performed at ambient pressure and under pressure. The relaxation rate 1/T_{1} for x = 0.14 shows T-linear behavior just above T_{c}, and pressure application enhances 1/T_{1}T similar to T_{c}. This fact implies that 1/T_{1}T = constant originates from Korringa relation and an increase in the density of state at the Fermi energy D(E_{F}) leads to the enhancement of T_{c}. In the case of x = 0.08, 1/T_{1} measured at ambient pressure also shows T-linear behavior in a wide temperature range above T_{c}. The value of 1/T_{1}T is enhanced compared to the x = 0.14 doped sample, although their T_{c} values are in the same range. The enhancement of 1/T_{1}T for x = 0.08 is attributable to antiferromagnetic fluctuation rather than an increase in D(E_{F}).

Original language | English |
---|---|

Article number | 012042 |

Journal | Journal of Physics: Conference Series |

Volume | 200 |

Issue number | SECTION 1 |

DOIs | |

Publication status | Published - 2010 Jan 1 |

Externally published | Yes |

### ASJC Scopus subject areas

- Physics and Astronomy(all)

## Fingerprint Dive into the research topics of 'Superconductivity of LaFeAsO<sub>1-x</sub>F<sub>x</sub> under high pressure studied using NMR'. Together they form a unique fingerprint.

## Cite this

_{1-x}F

_{x}under high pressure studied using NMR.

*Journal of Physics: Conference Series*,

*200*(SECTION 1), [012042]. https://doi.org/10.1088/1742-6596/200/1/012042