Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 80, Issue 3, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.80.033705
Keywords
NaFeAs; NMR; incommensurate antiferromagnetism; 111-type iron arsenide
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Funding
- Japan Society for the Promotion of Science [21340093]
- Ministry of Education, Culture, Sports, Science and Technology, Japan
- Grants-in-Aid for Scientific Research [21340093, 22840014] Funding Source: KAKEN
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We report the results of Na-23 and As-75 nuclear magnetic resonance (NMR) experiments on a self-flux grown high-quality single crystal of stoichiometric NaFeAs. The NMR spectra reveal a tetragonal to twinned-orthorhombic structural phase transition at T-O = 57K and an antiferromagnetic (AF) transition at T-AF = 45 K. The divergent behavior of nuclear relaxation rate near T-AF shows significant anisotropy, indicating that the critical slowing down of stripe-type AF fluctuations are strongly anisotropic in spin space. The NMR spectra at sufficiently low temperatures consist of sharp peaks showing a commensurate stripe AF order with a small moment of similar to 0.3 mu(B). However, the spectra just below T-AF exhibit a highly asymmetric broadening pointing to an incommensurate modulation. The commensurate-incommensurate crossover in NaFeAs shows a certain similarity to the behavior of SrFe2As2 under high pressure.
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