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Observation of magnetic order of Cu-moment aroundx=0.12 in La2−x Ba x CuO4 and La2−x sr x CuO4 by μ+SR

  • Session 4. Superconductors
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Abstract

Zero field positive muon spin rotation method (μ +SR) is applied on La2−x Sr x CuO4 around forx=0.12 at which the high-T c superconductivity (SC) is suppressed. The magnetically ordered state of Cu-moments, which is not a spin glass state but an antiferromagnetic like state, appears below 15 K for 0.105≤x≤0.120. The magnetic phase boundary is very similar to the one of the La2−x Ba x CuO4 in which the structural transition from the low temperature orthorhombic (LTO) phase to the low temperature tetragonal (LTT) phase is observed aroundx=0.12. The present study suggests that there is no big difference of the electronic state of the CuO2 plane between the La-Ba system and the La-Sr system and that the magnetic ordering of Cu-moments plays an important role for the suppression of the high-T c SC aroundx=0.12 in both of the systems, although the LTO-LTT structural transition has not been observed yet in the La-Sr system.

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Author notes

  1. Kanetada Nagamine

    Present address: The Institute of Physical and Chemical Research (RIKEN), USA

Authors and Affiliations

  1. The Institute of Physical and Chemical Research (RIKEN), Wako, 351-01, Saitama, Japan

    Isao Watanabe

  2. Meson Science Laboratory, Faculty of Science, University of Tokyo (UT-MSL), Hongo, 113, Tokyo, Japan

    Kusuo Nishiyama & Kanetada Nagamine

  3. Department of Physics, Faculty of Science, Hokkaido University, 060, Sapporo, Japan

    Kenji Kawano & Ken-ichi Kumagai

Authors
  1. Isao Watanabe
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  2. Kusuo Nishiyama
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  3. Kanetada Nagamine
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  4. Kenji Kawano
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  5. Ken-ichi Kumagai
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Watanabe, I., Nishiyama, K., Nagamine, K. et al. Observation of magnetic order of Cu-moment aroundx=0.12 in La2−x Ba x CuO4 and La2−x sr x CuO4 by μ+SR. Hyperfine Interact 86, 603–608 (1994). https://doi.org/10.1007/BF02068954

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