75As NQR and NMR studies of superconductivity and electron correlations in iron arsenide LiFeAs

Zheng Li, Yosuke Ooe, Xian Cheng Wang, Qing Qing Liu, Chang Qing Jin, Masanori Ichioka, Guo Qing Zheng

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69 Citations (Scopus)

Abstract

We report the 75As-NQR and NMR studies on the iron arsenide superconductor LiFeAs with Tc ∼ 17K. The spin lattice relaxation rate, 1/T1, decreases below Tc without a coherence peak, and can be fitted by gaps with s±-wave symmetry in the presence of impurity scattering. In the normal state, both 1/T1T and the Knight shift decrease with decreasing temperature but become constant below T ≤ 50 K. Estimate of the Korringa ratio shows that the spin correlations are weaker than those in other families of iron arsenides, which may account for the lower Tc in this material.

Original languageEnglish
Article number083702
Journaljournal of the physical society of japan
Volume79
Issue number8
DOIs
Publication statusPublished - Aug 2010

Keywords

  • Iron arsenide
  • NMR
  • NQR
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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