139La NQR Study of Electronic States in Metallic Compounds(La1-xSrx)2CuO4

  • Kobayashi Tatsuo
    College of Liberal Arts, Kobe University
  • Wada Shinji
    College of Liberal Arts, Kobe 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
  • Amaya Kiichi
    Department of Material Physics, Faculty of Engineering Science, Osaka University

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タイトル別名
  • <SUP>139</SUP>La NQR Study of Electronic States in Metallic Compounds (La<SUB>1−<I>x</I></SUB>Sr<I><SUB>x</SUB></I>)<SUB>2</SUB>CuO<SUB>4</SUB>
  • 139La NQR Study of Electronic States in
  • <sup>139</sup>La NQR Study of Electronic States in Metallic Compounds (La<sub>1-<i>x</i></sub>Sr<sub><i>x</i></sub>)<sub>2</sub>CuO<sub>4</sub>

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抄録

We measured the temperature dependence of the nuclear spin-lattice relaxation time T1 of 139La in metallic compounds (La1−xSrx)2CuO4 with x=0.045, 0.075, 0.10 (high-TC superconductors) and x=0.15 (nonsuperconductor) by NQR experimentation. T1 for x=0.15 was found to conform to the Korringa relation (T1T=const.) sufficiently, while the T1 for x=0.075 and 0.10 in the normal state showed slightly stronger temperature dependence and were shorter than that for x=0.15, in spite of the increase of hole concentration with increasing x. Fluctuations of Cu d-spins are considered to play an important role for T1 in superconducting compounds. The relaxation behavior in the compound with x=0.045 is also discussed.

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