NMR Study of Weak Antiferromagnetism in NbFe2

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  • Yamada Yoshihiro
    Department of Electrical Engineering, Faculty of Engineering, Himeji Institute of Technology
  • Nakamura Hiroyuki
    Department of Material Physics, Faculty of Engineering Science, Osaka University
  • Kitaoka Yoshio
    Department of Material Physics, Faculty of Engineering Science, Osaka University
  • Asayama Kunisuke
    Department of Material Physics, Faculty of Engineering Science, Osaka University
  • Koga Koichi
    Department of Electrical Engineering, Faculty of Engineering, Himeji Institute of Technology
  • Sakata Akihiko
    Department of Electrical Engineering, Faculty of Engineering, Himeji Institute of Technology
  • Murakami Tetsuro
    Department of Electrical Engineering, Faculty of Engineering, Himeji Institute of Technology

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  • NMR Study of Weak Antiferromagnetism in NbFe<SUB>2</SUB>
  • NMR Study of Weak Antiferromagnetism in

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The 93Nb NMR and magnetization have been measured to investigate the nature of weak antiferromagnetism in the hexagonal C-14 Laves phase compound, NbFe2. The temperature and magnetic field dependence of the magnetization and nuclear spin-lattice relaxation time, T1, confirmed that an antiferromagnetic transition occurs at low fields and is easily suppressed by fields above 6 kOe. An analysis of T1 shows that both the ferro- and antiferromagnetic spin fluctuations coexist in this system and that the ferromagnetic component is dominant at high fields. The coexistence of two components of the spin fluctuation may be related to the anomalous temperature dependence of the magnetic susceptibility at high temperatures. The analysis of NMR spectra suggests that the magnetic structure at the ordered state is of the spin density wave type giving rise to a large distribution of hyperfine field.

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