Raman scattering study of Sr14-xCaxCu24O41

Norio Ogita, Yoshinori Fujita, Yoshifumi Sakaguchi, Yuichi Fujino, Takashi Nagata, Jun Akimitsu, Masayuki Udagawa

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Polarized Raman scattering spectra of Sr14-xCaxCu24O41 have been measured for x = 0 and 11.5 at ambient pressure. In the spectra, the intra-molecular vibrations due to the unit structure of (Sr/Ca)2Cu2O3 and CuO2 have been clearly observed below 700 cm-1. A comparison of the number of the observed peaks with the results of a factor group analysis indicates that the crystallographic symmetry of the ladder is F222 for x = 0 and 11.5, instead of centro-symmetric Fmmm, while that of the chain is Amma for both compositions. However the symmetry of the chain for x = 11.5 is close to F222 or Fmmm. That is, the structure of the chains changes from an incomplete staggered structure to almost complete staggered one with increasing x. In the (c, c) and (a, a) spectra, the broad two-magnon peaks have been observed at around 3000cm-1. From the analysis of the recent theory of the magnetic scattering in the 2-leg spin ladder system done by Natsume et al., the following magnetic parameters for x = 0 are obtained: Jleg = 151 meV, Jrung = 91 meV, and Δladder = 44 meV. The values agree with those reported by neutron scattering.

Original languageEnglish
Pages (from-to)2684-2690
Number of pages7
Journaljournal of the physical society of japan
Issue number8
Publication statusPublished - Aug 2000
Externally publishedYes


  • Crystal structure
  • Magnon
  • Phonon
  • Raman scattering
  • Spin-ladder

ASJC Scopus subject areas

  • General Physics and Astronomy


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