Raman scattering investigation of high temperature ferromagnetic crystals

Masayuki Udagawa, Shinji Nagai, Norio Ogita, Fumitoshi Iga, Rina Kaji, Kazuyuki Sumida, Jun Akimitsu, Satoru Kunii, Kazuya Suzuki, Hideya Onodera, Yasuo Yamaguchi

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Phonon spectra of ferromagnetic CaB6 and CaB2C 2 have been investigated by Raman scattering. In CaB6, a doublet spectrum has been observed for Eg phonon and is understood by an anisotropic charge distribution at B6. For ferromagnetism, the magnetic moment of CaB6 is attributed to the B6 octahedron, since the intensity of the phonon peaks of A1g and E1g changes in the vicinity of ferromagnetic Curie temperature. These results of CaB6 are explained by electron condensate model. In CaB2C2 two phonon modes have been observed, but the spectra at higher temperature were not measured due to sample damage by laser. For both ferromagnetic crystals, the ionic interaction between Ca and B/C is smaller than that between rare earth ion and B/C in the isomorphous crystals. This result might be important to clarify a ferromagnetic interaction.

Original languageEnglish
Pages (from-to)314-316
Number of pages3
JournalJournal of the Physical Society of Japan
Volume71
Issue numberSUPPL.
Publication statusPublished - 2002
Externally publishedYes

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Raman spectra
crystals
charge distribution
ferromagnetism
condensates
Curie temperature
rare earth elements
magnetic moments
interactions
damage
lasers
ions
electrons

Keywords

  • CaBC
  • CaB
  • Exciton condensate model
  • Magnetic moment from B
  • Raman scattering

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Udagawa, M., Nagai, S., Ogita, N., Iga, F., Kaji, R., Sumida, K., ... Yamaguchi, Y. (2002). Raman scattering investigation of high temperature ferromagnetic crystals. Journal of the Physical Society of Japan, 71(SUPPL.), 314-316.

Raman scattering investigation of high temperature ferromagnetic crystals. / Udagawa, Masayuki; Nagai, Shinji; Ogita, Norio; Iga, Fumitoshi; Kaji, Rina; Sumida, Kazuyuki; Akimitsu, Jun; Kunii, Satoru; Suzuki, Kazuya; Onodera, Hideya; Yamaguchi, Yasuo.

In: Journal of the Physical Society of Japan, Vol. 71, No. SUPPL., 2002, p. 314-316.

Research output: Contribution to journalArticle

Udagawa, M, Nagai, S, Ogita, N, Iga, F, Kaji, R, Sumida, K, Akimitsu, J, Kunii, S, Suzuki, K, Onodera, H & Yamaguchi, Y 2002, 'Raman scattering investigation of high temperature ferromagnetic crystals', Journal of the Physical Society of Japan, vol. 71, no. SUPPL., pp. 314-316.
Udagawa M, Nagai S, Ogita N, Iga F, Kaji R, Sumida K et al. Raman scattering investigation of high temperature ferromagnetic crystals. Journal of the Physical Society of Japan. 2002;71(SUPPL.):314-316.
Udagawa, Masayuki ; Nagai, Shinji ; Ogita, Norio ; Iga, Fumitoshi ; Kaji, Rina ; Sumida, Kazuyuki ; Akimitsu, Jun ; Kunii, Satoru ; Suzuki, Kazuya ; Onodera, Hideya ; Yamaguchi, Yasuo. / Raman scattering investigation of high temperature ferromagnetic crystals. In: Journal of the Physical Society of Japan. 2002 ; Vol. 71, No. SUPPL. pp. 314-316.
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AU - Udagawa, Masayuki

AU - Nagai, Shinji

AU - Ogita, Norio

AU - Iga, Fumitoshi

AU - Kaji, Rina

AU - Sumida, Kazuyuki

AU - Akimitsu, Jun

AU - Kunii, Satoru

AU - Suzuki, Kazuya

AU - Onodera, Hideya

AU - Yamaguchi, Yasuo

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AB - Phonon spectra of ferromagnetic CaB6 and CaB2C 2 have been investigated by Raman scattering. In CaB6, a doublet spectrum has been observed for Eg phonon and is understood by an anisotropic charge distribution at B6. For ferromagnetism, the magnetic moment of CaB6 is attributed to the B6 octahedron, since the intensity of the phonon peaks of A1g and E1g changes in the vicinity of ferromagnetic Curie temperature. These results of CaB6 are explained by electron condensate model. In CaB2C2 two phonon modes have been observed, but the spectra at higher temperature were not measured due to sample damage by laser. For both ferromagnetic crystals, the ionic interaction between Ca and B/C is smaller than that between rare earth ion and B/C in the isomorphous crystals. This result might be important to clarify a ferromagnetic interaction.

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