19-F NMR Investigation of Iron-pnictide Superconductor LaFeAsO(0.89)F(0.11)

Abstract

We report 19-F NMR investigation of the new high temperature superconductor LaFeAsO(0.89)F(0.11) (Tc ~ 28K). We demonstrate that low frequency spin fluctuations exhibit pseudo gap behavior above Tc. We also deduce the London penetration depth lambda from NMR line broadening below Tc.Comment: Accepted for publication in Phys. Rev. B (Rapid) with the original submission dat