Observation of phase transition with lattice distortion in the low-dimensional quantum spin system TiOBr by synchrotron X-ray diffraction -evidence of spin-Peierls transition?-

Tomoyuki Sasaki, Masaichiro Mizumaki, Kenichi Kato, Yasuo Watabe, Yoshiki Nishihata, Masaki Takata, Jun Akimitsu

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Here, we report on the direct observation of lattice distortion in the new quasi-one-dimensional spin system TiOBr by X-ray diffraction experiment using synchrotoron radiation. By comparing the crystal structure between TiOBr and TiOCl, the difference in b-axis length was considered to play a key role in determining the physical properties of both systems. Using a single crystal sample of TiOBr, superlattice reflections were observed at (0, 1.5, 0) and (0, 2.5, 0). The temperature dependence of the superlattice reflections implied the first-order transition at Tc1 = 27 K. We discussed the phase transition and analyzed the data using a simple dimerization model.

Original languageEnglish
Pages (from-to)2185-2188
Number of pages4
Journaljournal of the physical society of japan
Volume74
Issue number8
DOIs
Publication statusPublished - Aug 1 2005
Externally publishedYes

Keywords

  • Crystal structure
  • Dimerization
  • Lattice distortion
  • Spin-Peierls transition
  • X-ray synchrotron radiation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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