Observation of Local Crystal Structure Change in (CaxLa1-x)(Ba1.75-xLa0.25+x)Cu3O7+.DELTA. Tetragonal Superconductor Using Raman Scattering.

• Sato Yasushi

  Materials and Structures Laboratory, Tokyo Institute of Technology

• Yoshioka Kohtaro

  Materials and Structures Laboratory, Tokyo Institute of Technology

• Valery Petrykin

  Materials and Structures Laboratory, Tokyo Institute of Technology

• Kakihana Masato

  Materials and Structures Laboratory, Tokyo Institute of Technology

• Tanaka Yoshito

  Department of Applied Physics, The National Defense Academy

• Yamaguchi Ai

  Department of Applied Physics, The National Defense Academy

• Katsumata Takahiro

  Department of Applied Physics, The National Defense Academy

• Yasuoka Hiroshi

  Department of Applied Physics, The National Defense Academy

Bibliographic Information

Other Title

• ラマン分光法による（ＣａｘＬａ１－ｘ）（Ｂａ１．７５－ｘＬａ０．２５＋ｘ）Ｃｕ３Ｏ７＋δの局所構造変化の観察
• ラマン ブンコウホウ ニ ヨル CaxLa1 x Ba1 75 xLa0 25 x Cu3O7 デルタ ノ キョクショ コウゾウ ヘンカ ノ カンサツ

Abstract

Polycrystalline samples of (Ca_xLa_1-x)(Ba_1.75-xLa_0.25+x)Cu₃O_7+δ(CLBCO) tetragonal superconductor for x from 0.0 to 0.6 were studied by Raman scattering technique, which is sensitive to oxygen site symmetry in the high-T_c superconductors. On the Raman spectra, five extra modes at 200, 320, 400, 565 and 610 cm^-1, which did not appear on Raman spectra of tetragonal YBa₂Cu₃O₆, were observed. Based on the model that apical oxygen O(4) is displaced by La³⁺ on Ba site and the result of group theoretical analysis for this model, the 565 cm^-1 mode which possessed the strongest intensity among these extra modes could be assigned to another O(4) vibration. This indicates that O(4) is strongly attracted by La³⁺ on Ba site, resulting in a change of local structure.

Journal

• Journal of the Japan Society of Powder and Powder Metallurgy

  Journal of the Japan Society of Powder and Powder Metallurgy 49 (5), 372-376, 2002

  Japan Society of Powder and Powder Metallurgy

Keywords

• cuprate superconductor
• Raman scattering
• amorphous citric acid method
• local crystal structure
• cation disordering

Details

• CRID: 1390282681283670400
• NII Article ID: 10008559513
• NII Book ID: AN00222724
• DOI: 10.2497/jjspm.49.372
• ISSN: 18809014
• ISSN: 05328799
• NDL BIB ID: 6169323
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6169323
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed