Electron Diffraction Study of an Inorganic Spin-Peierls System CuGeO3

Osamu Kamimura, Masami Terauchi, Michivoshi Tanaka, Osamu Fujita, Jun Akimitsu

Research output: Contribution to journalArticle

93 Citations (Scopus)

Abstract

An electron diffraction study of an inorganic spin-Peierls system CuGeO3 was performed. Weak superlattice reflections indexed by (h/2)k(l/2)(h, k, l: odd) are observed in electron diffraction patterns taken at about 10 K with the [100] electron incidence. The reflections are interpreted as characteristic of a superlattice structure of the space group Bbcm or Bbmm with cell dimensions a' ≃ 2a, b' ≃ b and c'≃ 2c and with dimerization of Cu atoms along the quasi-one-dimensional [001] or the [010] direction, which is strong evidence of the spin-Peierls transition. Strong diffuse streaks which run along the redirection through the fundamental reflections are observed at the same temperature. The streaks are attributed to low-frequency transverse acoustic waves of the oxygen octahedra and can be precursors to another phase transformation below the spin-Peierls transition.

Original languageEnglish
Pages (from-to)2467-2471
Number of pages5
Journaljournal of the physical society of japan
Volume63
Issue number7
DOIs
Publication statusPublished - Jan 1 1994
Externally publishedYes

Keywords

  • CuGeO3
  • diffuse streaks
  • dimerization
  • electron diffraction
  • spin-Peierls transition
  • superlattice reflections

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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