Reexamination of Spin Dynamics in La_2CuO_4 by Cu-NQR

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概要

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• The nuclear spin-lattice relaxation rate 1/T_1 and the indirect nuclear spin-spin relaxation rate 1/T_<2g> for ^<63>Cu in La_2CuO_4 (T_N=312K) were reexamined from 400K to l000K, expanding the temperature range of the first observation by Imai et al. The temperature dependence of 1/T_1 is in good agreement with the previous result, while 1/T_<2g> decreases more rapidly with temperature. The temperature dependences of both 1/T_1 and 1/T_<2g> closely follow the renormalized classical (RC) formula below about 600K, but deviate from the RC prediction above 600K. The scaling relation between 1/T_1 and 1/T_<2g> was not confirmed above 600K, in conflict with the theoretical prediction for the quantum critical (QC) regime. Hence, we argue that the deviation from the RC formula above 600K does not necessarily correspond to a crossover from the RC to the QC regime.

• 社団法人日本物理学会の論文
• 1994-12-15

著者

• UEDA Yutaka

  Institute for Solid State Physics, University of Tokyo

• YASUOKA Hiroshi

  Institute for Solid State Physics,University of Tokyo

• Ueda Yutaka

  Institute For Solid State Physics University Of Tokyo

• ITOH Yutaka

  Department of Chemistry, Graduate School of Science, Kyoto University

• Itoh Y

  Shizuoka Univ. Shizuoka

• Itoh Yutaka

  Department Of Chemistry Graduate School Of Science Kyoto University

• Itoh Y

  Superconductivity Research Laboratory International Superconductivity Technology Center

• MATSUMURA Masahiro

  Department of Physics, Kobe University

• Matsumura M

  Faculty Of Science Kochi University

• Matsumura Masahiro

  Department Of Material Science Faculty Of Science Kochi University

• Yasuoka Hiroshi

  Institute For Chemistry Research Kyoto University

• Yasuoka Hiroshi

  Department Of Mathematics And Physics The National Defense Academy

• Yamagata Hideki

  Department of Physics, Faculty of Science, Kochi University

• Matsumura M

  Department Of Material Science Faculty Of Science Kochi University

• Yamagata Hideki

  Department Of Material Science Faculty Of Science Kochi University

• Yamagata Hideki

  Faculty Of Science Kochi University

• Matsumura Masahiro

  Department Of Physics Faculty Of Science Kouchi University

• YASUOKA Hiroshi

  ISSP of the University of Tokyo

• Itoh Yuichi

  Faculty Of Human Cultures Fukuyama University

• Yasuoka Hiroshi

  Institute Fo Solid State Physics University Of Tokyo

• Ueda Yutaka

  Institute For Solid State Physic The University Of Tokyo

• Itoh Yutaka

  Department of Material Science, Faculty of Science, Kochi University

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