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

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 journal › Article › peer-review

4 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 E_g 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 A_1g and E1_g 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 language	English
Pages (from-to)	314-316
Number of pages	3
Journal	journal of the physical society of japan
Volume	71
Issue number	SUPPL.
Publication status	Published - Dec 1 2002
Externally published	Yes

Keywords

CaB
CaBC
Exciton condensate model
Magnetic moment from B
Raman scattering

ASJC Scopus subject areas

Physics and Astronomy(all)

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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., 01.12.2002, p. 314-316.

Research output: Contribution to journal › Article › peer-review

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title = "Raman scattering investigation of high temperature ferromagnetic crystals",

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.",

keywords = "CaB, CaBC, Exciton condensate model, Magnetic moment from B, Raman scattering",

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

year = "2002",

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T1 - Raman scattering investigation of high temperature ferromagnetic crystals

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

PY - 2002/12/1

Y1 - 2002/12/1

N2 - 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.

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.

KW - CaB

KW - CaBC

KW - Exciton condensate model

KW - Magnetic moment from B

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