Guest ion motion in cage structure crystals investigated by Raman scattering

Masayuki Udagawa; Takumi Hasegawa; Yuichi Takasu; Norio Ogita; Koichiro Suekuni; Marcos A. Avila; Toshiro Takabatake; Yoshikazu Ishikawa; Naoya Takeda; Yuichi Nemoto; Terutaka Goto; Hitoshi Sugawara; Daisuke Kikuchi; Hideyuki Sato; Chihiro Sekine; Ichimin Shirotani; Jun Ichi Yamaura; Yohei Nagao; Zenji Hiroi

doi:10.1143/JPSJS.77SA.142

Guest ion motion in cage structure crystals investigated by Raman scattering

Masayuki Udagawa, Takumi Hasegawa, Yuichi Takasu, Norio Ogita, Koichiro Suekuni, Marcos A. Avila, Toshiro Takabatake, Yoshikazu Ishikawa, Naoya Takeda, Yuichi Nemoto, Terutaka Goto, Hitoshi Sugawara, Daisuke Kikuchi, Hideyuki Sato, Chihiro Sekine, Ichimin Shirotani, Jun Ichi Yamaura, Yohei Nagao, Zenji Hiroi

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

12 Citations (Scopus)

Abstract

Last five years we have mainly investigated phonons in the following cage compounds by Raman scattering: RT₄X₁₂, A ₈Ga₁₆Ge₃₀, La₃Pd₂₀Ge ₆, RB₆, KOs₂O₆. From this systematic investigation we have clarified the following dynamical properties of the guest ion trapped in the large cages. The vibration of the guest ion is highly anharmonic due to weak atomic interaction between the guest ion and cage atom. This anharmonicity universally decreases the vibration energy of the guest ion with decreasing temperature. The existence of carriers decreases the interaction between the guest atoms and changes the dispersion curve of the guest ion mode to flat, which is the experimental evidence of the weak interaction between the guest atoms. For thermoelectricity, it is found in A₈Ga ₁₆Ge₃₀ that the off-center rattling decreases lattice thermal conductivity.

Original language	English
Pages (from-to)	142-147
Number of pages	6
Journal	journal of the physical society of japan
Volume	77
Issue number	SUPPL.A
DOIs	https://doi.org/10.1143/JPSJS.77SA.142
Publication status	Published - Jan 1 2008
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1143/JPSJS.77SA.142

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Udagawa, M., Hasegawa, T., Takasu, Y., Ogita, N., Suekuni, K., Avila, M. A., Takabatake, T., Ishikawa, Y., Takeda, N., Nemoto, Y., Goto, T., Sugawara, H., Kikuchi, D., Sato, H., Sekine, C., Shirotani, I., Yamaura, J. I., Nagao, Y., & Hiroi, Z. (2008). Guest ion motion in cage structure crystals investigated by Raman scattering. journal of the physical society of japan, 77(SUPPL.A), 142-147. https://doi.org/10.1143/JPSJS.77SA.142

Udagawa, M, Hasegawa, T, Takasu, Y, Ogita, N, Suekuni, K, Avila, MA, Takabatake, T, Ishikawa, Y, Takeda, N, Nemoto, Y, Goto, T, Sugawara, H, Kikuchi, D, Sato, H, Sekine, C, Shirotani, I, Yamaura, JI, Nagao, Y & Hiroi, Z 2008, 'Guest ion motion in cage structure crystals investigated by Raman scattering', journal of the physical society of japan, vol. 77, no. SUPPL.A, pp. 142-147. https://doi.org/10.1143/JPSJS.77SA.142

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title = "Guest ion motion in cage structure crystals investigated by Raman scattering",

abstract = "Last five years we have mainly investigated phonons in the following cage compounds by Raman scattering: RT4X12, A 8Ga16Ge30, La3Pd20Ge 6, RB6, KOs2O6. From this systematic investigation we have clarified the following dynamical properties of the guest ion trapped in the large cages. The vibration of the guest ion is highly anharmonic due to weak atomic interaction between the guest ion and cage atom. This anharmonicity universally decreases the vibration energy of the guest ion with decreasing temperature. The existence of carriers decreases the interaction between the guest atoms and changes the dispersion curve of the guest ion mode to flat, which is the experimental evidence of the weak interaction between the guest atoms. For thermoelectricity, it is found in A8Ga 16Ge30 that the off-center rattling decreases lattice thermal conductivity.",

author = "Masayuki Udagawa and Takumi Hasegawa and Yuichi Takasu and Norio Ogita and Koichiro Suekuni and Avila, {Marcos A.} and Toshiro Takabatake and Yoshikazu Ishikawa and Naoya Takeda and Yuichi Nemoto and Terutaka Goto and Hitoshi Sugawara and Daisuke Kikuchi and Hideyuki Sato and Chihiro Sekine and Ichimin Shirotani and Yamaura, {Jun Ichi} and Yohei Nagao and Zenji Hiroi",

year = "2008",

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doi = "10.1143/JPSJS.77SA.142",

language = "English",

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AU - Udagawa, Masayuki

AU - Hasegawa, Takumi

AU - Takasu, Yuichi

AU - Ogita, Norio

AU - Suekuni, Koichiro

AU - Avila, Marcos A.

AU - Takabatake, Toshiro

AU - Ishikawa, Yoshikazu

AU - Takeda, Naoya

AU - Nemoto, Yuichi

AU - Goto, Terutaka

AU - Sugawara, Hitoshi

AU - Kikuchi, Daisuke

AU - Sato, Hideyuki

AU - Sekine, Chihiro

AU - Shirotani, Ichimin

AU - Yamaura, Jun Ichi

AU - Nagao, Yohei

AU - Hiroi, Zenji

PY - 2008/1/1

Y1 - 2008/1/1

N2 - Last five years we have mainly investigated phonons in the following cage compounds by Raman scattering: RT4X12, A 8Ga16Ge30, La3Pd20Ge 6, RB6, KOs2O6. From this systematic investigation we have clarified the following dynamical properties of the guest ion trapped in the large cages. The vibration of the guest ion is highly anharmonic due to weak atomic interaction between the guest ion and cage atom. This anharmonicity universally decreases the vibration energy of the guest ion with decreasing temperature. The existence of carriers decreases the interaction between the guest atoms and changes the dispersion curve of the guest ion mode to flat, which is the experimental evidence of the weak interaction between the guest atoms. For thermoelectricity, it is found in A8Ga 16Ge30 that the off-center rattling decreases lattice thermal conductivity.

AB - Last five years we have mainly investigated phonons in the following cage compounds by Raman scattering: RT4X12, A 8Ga16Ge30, La3Pd20Ge 6, RB6, KOs2O6. From this systematic investigation we have clarified the following dynamical properties of the guest ion trapped in the large cages. The vibration of the guest ion is highly anharmonic due to weak atomic interaction between the guest ion and cage atom. This anharmonicity universally decreases the vibration energy of the guest ion with decreasing temperature. The existence of carriers decreases the interaction between the guest atoms and changes the dispersion curve of the guest ion mode to flat, which is the experimental evidence of the weak interaction between the guest atoms. For thermoelectricity, it is found in A8Ga 16Ge30 that the off-center rattling decreases lattice thermal conductivity.

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JO - Journal of the Physical Society of Japan

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Guest ion motion in cage structure crystals investigated by Raman scattering

Abstract

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