Raman scattering study of the guest ion motion in caged crystals

Y. Takasu; T. Hasegawa; N. Ogita; M. Udagawa; M. A. Avila; K. Suekuni; T. Takabatake; T. Yamaguchi; T. Watanabe; Y. Nemoto; T. Goto; Z. Hiroi

doi:10.1109/ICT.2006.331263

Raman scattering study of the guest ion motion in caged crystals

Y. Takasu, T. Hasegawa, N. Ogita, M. Udagawa, M. A. Avila, K. Suekuni, T. Takabatake, T. Yamaguchi, T. Watanabe, Y. Nemoto, T. Goto, Z. Hiroi

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Citation (Scopus)

Abstract

The guest ion motion has been investigated by Raman scattering for the following caged crystals: La₃Pd₂₀X₆ (X=Ge, Si), X₈Ga₁₆Ge₃₀ (X=Ba, Sr, Eu), and KOs ₂O₆. The observed Raman peaks have been well assigned by the polarization dependence and the first principles calculation. It has been found that the energy of the guest ion anomalously decreases with decreasing temperature for X₈Ga₁₆Ge₃₀, La ₃Pd₂₀Ge₆, and KOs₂O₆, where the rattling motion of the guest ion has been reported. However, such anomalous decrease has not been observed in La₃Pd₂₀Si ₆ (no rattling). The origin of the energy decrease is understood by the existence of the large quartic anharmonic potential. Furthermore, the existence of carriers is important for the rattling mode.

Original language	English
Title of host publication	Proceedings ICT'06 - 25th International Conference on Thermoelectrics
Pages	33-35
Number of pages	3
DOIs	https://doi.org/10.1109/ICT.2006.331263
Publication status	Published - 2006
Externally published	Yes
Event	ICT'06 - 25th International Conference on Thermoelectrics - Vienna, Austria Duration: Aug 6 2006 → Aug 10 2006

Publication series

Name	International Conference on Thermoelectrics, ICT, Proceedings

Other

Other	ICT'06 - 25th International Conference on Thermoelectrics
Country/Territory	Austria
City	Vienna
Period	8/6/06 → 8/10/06

All Science Journal Classification (ASJC) codes

Engineering(all)

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10.1109/ICT.2006.331263

Cite this

Takasu, Y., Hasegawa, T., Ogita, N., Udagawa, M., Avila, M. A., Suekuni, K., Takabatake, T., Yamaguchi, T., Watanabe, T., Nemoto, Y., Goto, T., & Hiroi, Z. (2006). Raman scattering study of the guest ion motion in caged crystals. In Proceedings ICT'06 - 25th International Conference on Thermoelectrics (pp. 33-35). [4133229] (International Conference on Thermoelectrics, ICT, Proceedings). https://doi.org/10.1109/ICT.2006.331263

Takasu, Y, Hasegawa, T, Ogita, N, Udagawa, M, Avila, MA, Suekuni, K, Takabatake, T, Yamaguchi, T, Watanabe, T, Nemoto, Y, Goto, T & Hiroi, Z 2006, Raman scattering study of the guest ion motion in caged crystals. in Proceedings ICT'06 - 25th International Conference on Thermoelectrics., 4133229, International Conference on Thermoelectrics, ICT, Proceedings, pp. 33-35, ICT'06 - 25th International Conference on Thermoelectrics, Vienna, Austria, 8/6/06. https://doi.org/10.1109/ICT.2006.331263

@inproceedings{01e630ef244a41c0b3e30257940050c0,

title = "Raman scattering study of the guest ion motion in caged crystals",

abstract = "The guest ion motion has been investigated by Raman scattering for the following caged crystals: La3Pd20X6 (X=Ge, Si), X8Ga16Ge30 (X=Ba, Sr, Eu), and KOs 2O6. The observed Raman peaks have been well assigned by the polarization dependence and the first principles calculation. It has been found that the energy of the guest ion anomalously decreases with decreasing temperature for X8Ga16Ge30, La 3Pd20Ge6, and KOs2O6, where the rattling motion of the guest ion has been reported. However, such anomalous decrease has not been observed in La3Pd20Si 6 (no rattling). The origin of the energy decrease is understood by the existence of the large quartic anharmonic potential. Furthermore, the existence of carriers is important for the rattling mode.",

author = "Y. Takasu and T. Hasegawa and N. Ogita and M. Udagawa and Avila, {M. A.} and K. Suekuni and T. Takabatake and T. Yamaguchi and T. Watanabe and Y. Nemoto and T. Goto and Z. Hiroi",

year = "2006",

doi = "10.1109/ICT.2006.331263",

language = "English",

isbn = "1424408105",

series = "International Conference on Thermoelectrics, ICT, Proceedings",

pages = "33--35",

booktitle = "Proceedings ICT'06 - 25th International Conference on Thermoelectrics",

note = "ICT'06 - 25th International Conference on Thermoelectrics ; Conference date: 06-08-2006 Through 10-08-2006",

}

TY - GEN

T1 - Raman scattering study of the guest ion motion in caged crystals

AU - Takasu, Y.

AU - Hasegawa, T.

AU - Ogita, N.

AU - Udagawa, M.

AU - Avila, M. A.

AU - Suekuni, K.

AU - Takabatake, T.

AU - Yamaguchi, T.

AU - Watanabe, T.

AU - Nemoto, Y.

AU - Goto, T.

AU - Hiroi, Z.

PY - 2006

Y1 - 2006

N2 - The guest ion motion has been investigated by Raman scattering for the following caged crystals: La3Pd20X6 (X=Ge, Si), X8Ga16Ge30 (X=Ba, Sr, Eu), and KOs 2O6. The observed Raman peaks have been well assigned by the polarization dependence and the first principles calculation. It has been found that the energy of the guest ion anomalously decreases with decreasing temperature for X8Ga16Ge30, La 3Pd20Ge6, and KOs2O6, where the rattling motion of the guest ion has been reported. However, such anomalous decrease has not been observed in La3Pd20Si 6 (no rattling). The origin of the energy decrease is understood by the existence of the large quartic anharmonic potential. Furthermore, the existence of carriers is important for the rattling mode.

AB - The guest ion motion has been investigated by Raman scattering for the following caged crystals: La3Pd20X6 (X=Ge, Si), X8Ga16Ge30 (X=Ba, Sr, Eu), and KOs 2O6. The observed Raman peaks have been well assigned by the polarization dependence and the first principles calculation. It has been found that the energy of the guest ion anomalously decreases with decreasing temperature for X8Ga16Ge30, La 3Pd20Ge6, and KOs2O6, where the rattling motion of the guest ion has been reported. However, such anomalous decrease has not been observed in La3Pd20Si 6 (no rattling). The origin of the energy decrease is understood by the existence of the large quartic anharmonic potential. Furthermore, the existence of carriers is important for the rattling mode.

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U2 - 10.1109/ICT.2006.331263

DO - 10.1109/ICT.2006.331263

M3 - Conference contribution

AN - SCOPUS:46149098946

SN - 1424408105

SN - 9781424408108

T3 - International Conference on Thermoelectrics, ICT, Proceedings

SP - 33

EP - 35

BT - Proceedings ICT'06 - 25th International Conference on Thermoelectrics

T2 - ICT'06 - 25th International Conference on Thermoelectrics

Y2 - 6 August 2006 through 10 August 2006

ER -

Raman scattering study of the guest ion motion in caged crystals

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