Raman scattering study of CaB6 and YbB6

Norio Ogita, Shinji Nagai, Naoki Okamoto, Fumitoshi Iga, Satoru Kunii, Toshiro Akamtsu, Jun Akimitsu, Masayuki Udagawa

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Phonon spectra of CaB6 and RB6 (R=Yb, Ce, and Pr) have been investigated by Raman scattering. We found clear spectral difference between divalent cation hexaboride and trivalent one. Eg mode shows the doublet spectra for only the divalent crystals of CaB6 and YbB6. The doublet spectra are understood by the two-dimensional charge distribution on B6 without lattice distortion. In addition, the scattered intensities of the phonons change at around the ferromagnetic Curie temperature for YbB6 and at T≃600K for CaB6. These are the characteristic temperatures due to the change of the electronic system.

Original languageEnglish
Pages (from-to)461-465
Number of pages5
JournalJournal of Solid State Chemistry
Volume177
Issue number2
DOIs
Publication statusPublished - Feb 2004
Externally publishedYes

Keywords

  • Anisotropic charge distribution of B
  • CaB
  • Ferromagnetism
  • Raman scattering
  • YbB

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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