Crossover from Commensurate to Incommensurate Antiferromagnetism in Stoichiometric NaFeAs Revealed by Single-Crystal 23Na,75As-NMR Experiments
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概要
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We report the results of 23Na and 75As 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_{\text{O}} = 57 K and an antiferromagnetic (AF) transition at T_{\text{AF}} = 45 K. The divergent behavior of nuclear relaxation rate near T_{\text{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 {\sim}0.3 \mu_{\text{B}}. However, the spectra just below T_{\text{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.
- 2011-03-15
著者
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Matsubayashi Kazuyuki
Institute For Solid State Physics The University Of Tokyo
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Kitagawa Kentaro
Institute For Solid State Physics University Of Tokyo
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Takigawa Masashi
Institute For Solid State Physics Iniversity Of Tokyo
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Uwatoko Yoshiya
Institute For Solid State Physics (issp) The University Of Tokyo
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Mezaki Yuji
Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Uwatoko Yoshiya
Institute for Solid State Physics
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