<SUP>7</SUP>Li Spin–Lattice Relaxation at Low Temperatures in a Superionic Conductor β-LiGa

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  • Endou Shigeki
    Department of Quantum Materials Science, Institute of Technology, The University of Tokushima
  • Ohno Takashi
    Department of Quantum Materials Science, Institute of Technology, The University of Tokushima
  • Kishimoto Yutaka
    Department of Quantum Materials Science, Institute of Technology, The University of Tokushima
  • Nishioka Daisuke
    Department of Quantum Materials Science, Institute of Technology, The University of Tokushima
  • Michihiro Yoshitaka
    Department of Quantum Materials Science, Institute of Technology, The University of Tokushima
  • Kawasaki Yu
    Department of Quantum Materials Science, Institute of Technology, The University of Tokushima
  • Ideta Yukiichi
    Department of Quantum Materials Science, Institute of Technology, The University of Tokushima
  • Kuriyama Kazuo
    College of Engineering and Research Center of Ion Beam Technology, Hosei University
  • Hamanaka Hiromi
    College of Engineering and Research Center of Ion Beam Technology, Hosei University
  • Yahagi Masahito
    Faculty of Engineering, Aomori University

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Other Title
  • 7Li spin-lattice relaxation at low temperatures in a superionic conductor β-LiGa
  • 7Li spin lattice relaxation at low temperatures in a superionic conductor v LiGa

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In order to investigate the Li+ ionic diffusion and the electronic states in a mixed conductor β-LiGa with high Li+ ionic diffusibility and electron/hole conductivity, 7Li NMR linewidth and spin–lattice relaxation measurements have been performed in 44.0, 47.0, and 50.0 at. % Li β-LiGa samples at 10.03 MHz in the temperature range between 10 and 320 K. The onset temperature TMN=70 K of the motional narrowing in 50.0 at. % sample has been determined from the temperature dependence of the linewidth. The Li+ ionic diffusion is found to contribute to the spin–lattice relaxation rate 1⁄T1 down to ∼0.5 TMN even below TMN where the motional narrowing does not occur. The high diffusibility of Li+ ions has been proved from a microscopic point of view. At low temperatures, the relations 1⁄T1T=3.5×10−4, 3.8×10−4, and 5.1×10−4 s−1 K−1 are observed in 44.0, 47.0, and 50.0 at. % Li samples, respectively. The density of states of conduction electrons at the Fermi level in these compounds becomes higher with increasing Li content, which is consistent with the predictions by band calculations.

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