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 language | English |
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Pages (from-to) | 2467-2471 |
Number of pages | 5 |
Journal | journal of the physical society of japan |
Volume | 63 |
Issue number | 7 |
DOIs | |
Publication status | Published - 1994 |
Externally published | Yes |
Keywords
- CuGeO3
- diffuse streaks
- dimerization
- electron diffraction
- spin-Peierls transition
- superlattice reflections
ASJC Scopus subject areas
- Physics and Astronomy(all)