Raman scattering study of CaB6 and YbB6

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

doi:10.1016/j.jssc.2003.02.014

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 journal › Article › peer-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. E_g 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 language	English
Pages (from-to)	461-465
Number of pages	5
Journal	Journal of Solid State Chemistry
Volume	177
Issue number	2
DOIs	https://doi.org/10.1016/j.jssc.2003.02.014
Publication status	Published - Feb 2004
Externally published	Yes

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

Access to Document

10.1016/j.jssc.2003.02.014

Cite this

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title = "Raman scattering study of CaB6 and YbB6",

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.",

keywords = "Anisotropic charge distribution of B, CaB, Ferromagnetism, Raman scattering, YbB",

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

note = "Funding Information: This work is supported in part by a Grant-in-Aid for COE Research (No. 13CE2002) of the Ministry of Education, Culture, Sports, Science and Technology of Japan. The low temperature experiments is supported by the cryogenic center of Hiroshima University. ",

year = "2004",

month = feb,

doi = "10.1016/j.jssc.2003.02.014",

language = "English",

volume = "177",

pages = "461--465",

journal = "Journal of Solid State Chemistry",

issn = "0022-4596",

publisher = "Academic Press Inc.",

number = "2",

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T1 - Raman scattering study of CaB6 and YbB6

AU - Ogita, Norio

AU - Nagai, Shinji

AU - Okamoto, Naoki

AU - Iga, Fumitoshi

AU - Kunii, Satoru

AU - Akamtsu, Toshiro

AU - Akimitsu, Jun

AU - Udagawa, Masayuki

N1 - Funding Information: This work is supported in part by a Grant-in-Aid for COE Research (No. 13CE2002) of the Ministry of Education, Culture, Sports, Science and Technology of Japan. The low temperature experiments is supported by the cryogenic center of Hiroshima University.

PY - 2004/2

Y1 - 2004/2

N2 - 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.

AB - 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.

KW - Anisotropic charge distribution of B

KW - CaB

KW - Ferromagnetism

KW - Raman scattering

KW - YbB

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