75As and 139La NMR/NQR investigations of iron-based superconductor LaFeAs(O0.89F0.11)

Y. Nakai, S. Kitagawa, K. Ishida, Y. Kamihara, M. Hirano, H. Hosono

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Abstract

We report 75As and 139La NMR/NQR results in LaFeAs(O0.89F0.11). In the normal state, 1/T1T decreases with lowered temperature, which is reminiscent of the pseudogap behavior in the high-Tc cuprates. In the superconducting (SC) state, 1/T1 decreases suddenly below Tc without a Hebel-Slichter coherence peak, followed by a T3 dependence, which is characteristics of unconventional superconductors with lines of nodes. However, the residual density of states in the low temperatures, which is usually observed in unconventional superconductors with crystal imperfections and/or impurity phases, was not observed. Knight shift measurements show that spin susceptibility decreases in the SC state.

Original languageEnglish
Article number052179
JournalJournal of Physics: Conference Series
Volume150
Issue number5
DOIs
Publication statusPublished - 2009 Jan 1

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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