Spectroscopic Study of 75As and 139La NMR on Layered Structure Ferromagnet LaCoAsO
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概要
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75As and 139La field-swept NMR spectra were obtained for the novel weakly itinerant ferromagnet LaCoAsO with a two-dimensional layered structure above the Curie temperature of 55 K. By analyzing NMR spectra, temperature dependences of Knight shift $K$ and nuclear quadrupole resonance frequency $\nu_{\text{Q}}$ were obtained successfully for each nucleus. We confirmed from the so-called $K$–$\chi$ plots that the macroscopic magnetization of our LaCoAsO powder sample is intrinsic and does not contain the contribution from impurity phases. We estimated hyperfine coupling constants from the slope of $K$–$\chi$ plots and compared them with that of an iron-arsenide superconductor.
- 2010-05-15
著者
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Yoshimura Kazuyoshi
Department Of Applied Science Tokyo Electrical Engineering College
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Ohta Hiroto
Department Of Chemistry Graduate School Of Science Kyoto University
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Michioka Chishiro
Department Of Chemistry Graduate School Of Science Kyoto University
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Michioka Chishiro
Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
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