Oxygen disordering and charge transfer effect in YBa2-xSrxCu3O7-d

Masato Kakihana, Minoru Osada, Susumu Katano, Hiromasa Mazaki, Hiroshi Yasuoka, Masatomo Yashima, Masahiro Yoshimura

Research output: Contribution to journalArticlepeer-review

Abstract

We have investigated neutron powder diffraction of YBa2-xSrxCu3O7-d with x=0, 0.4, 0.8 and 1. Their Rietveld analyses were carried out in space group Pmmm assuming two different disordering models: Model A where the O(1) is displaced from (0,1/2,0) to (x,1/2,0) so that each alternate chain has some kind of zig-zag chain and Model B where the available oxygen atoms are located at both the O(1) and O(5) sites to give full and empty Cu-O chains along the a-axis. The refinements based on model B have revealed that substitution of Sr for Ba causes an increase of isotropic temperature factor for the O(1), indicating an increasing in local oxygen disordering. This disordering in the model B is consistent with the Raman results that the defect induced mode gains intensity with increasing Sr content. A .possible picture of the slight decrease of Tc in YBa2-xSrxCu3O7-d is discussed in terms of both local oxygen disordering and associated charge-transfer effect.

Original languageEnglish
Pages (from-to)195-199
Number of pages5
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume43
Issue number2
DOIs
Publication statusPublished - 1996 Jan 1

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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