139La NQR Study of Electronic States in Metallic Compounds (La1-xSrx)2CuO4
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概要
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We measured the temperature dependence of the nuclear spin-lattice relaxation time $T_{1}$ of 139La in metallic compounds (La1-xSrx)2CuO4 with $x{=}0.045$, 0.075, 0.10 (high-$T_{\text{C}}$ superconductors) and $x{=}0.15$ (nonsuperconductor) by NQR experimentation. $T_{1}$ for $x{=}0.15$ was found to conform to the Korringa relation ($T_{1}T$${=}$const.) sufficiently, while the $T_{1}$ 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 $T_{1}$ in superconducting compounds. The relaxation behavior in the compound with $x{=}0.045$ is also discussed.
- INSTITUTE OF PURE AND APPLIED PHYSICSの論文
- 1989-03-15
著者
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Asayama Kunisuke
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Wada Shinji
College Of Liberal Arts Kobe University
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Kitaoka Yoshio
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Amaya Kiichi
Department Of Material Physics Faculty Of Engineering Science
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Kobayashi Tatsuo
College Of Liberal Arts Kobe University
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Asayama Kunisuke
Department of Material Physics, Faculty of Engineering Science, Osaka University, Toyonaka, Osaka 560
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Amaya Kiichi
Department of Material Physics, Faculty of Engineering Science, Osaka University, Toyonaka, Osaka 560
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Wada Shinji
College of Liberal Arts, Kobe University, Nada, Kobe 657
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