Crystallochemical Studies on the High Temperature Superconductors La_<2-x>M_xCuO_<4-y> (M=Ba and Sr)

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概要

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• High temperature superconductors La_<2-x>M_xCuO_<4-y> (M=Ba and Sr) with the K_2NiF_4 structure were synthesized by solid state reaction and characterized by X-ray diffraction, electron microscopy, IR measurements and thermogravimetry. Anomalous behavior of unit cell parameters was confirmed. Electron diffraction study of the orthorhombic La_2CuO_4 revealed weak forbidden spots for Fmmm symmetry, suggesting a space group of lower symmetry. One of three IR bands observed in La_2CuO_4 rapidly disappeared around X=0.1. Highest superconducting transition temperature was found to be 38.0 K in La_<1.85>Sr_<0.15>CuO_<3.96>.

• 社団法人応用物理学会の論文
• 1987-04-20

著者

• HIRAGA Kenji

  Institute for Materials Research, Tohoku University

• KIKUCHI Masae

  Institute for Materials Research,Tohoku University

• SYONO Yasuhiko

  Institute for Materials Research,Tohoku University

• Kikuchi Masae

  Institute For Material Research Tohoku University

• Syono Y

  Tohoku Univ. Sendai Jpn

• Someya Yoshiko

  Institute For Material Research Tohoku University

• Syono Yasuhiko

  Institute For Materials Research Tohoku University

• OH-ISHI Katsuyoshi

  Institute for Materials Research, Tohoku University

• Hiraga K

  Institute For Materials Research Tohoku University

• Hiraga Kenji

  Institute For Materials Research

• Moroishi K

  Hoya Corp. Tokyo Jpn

• MORIOKA Yoshiyuki

  Department of Chemistry,Faculty of Science,Tohoku University

• Oh-ishi Katsuyoshi

  Institute For Materials Research Tohoku University

• Morioka Yoshiyuki

  Department Of Chemistry Faculty Of Science Saitama University

• Kikuchi Masae

  Institute for Iron, Steel and Other Metals, Tohoku University

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