Raman scattering of type-I clathrate compounds

Yuichi Takasu; Takumi Hasegawa; Norio Ogita; Masayuki Udagawa; Marcos A. Avila; Koichiro Suekuni; Toshiro Takabatake

doi:10.1143/JPSJS.77SA.254

Raman scattering of type-I clathrate compounds

Yuichi Takasu, Takumi Hasegawa, Norio Ogita, Masayuki Udagawa, Marcos A. Avila, Koichiro Suekuni, Toshiro Takabatake

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

1 Citation (Scopus)

Abstract

Rattling motion of a guest ion in type-I clathrate compounds has been studied by Raman scattering measurements. The anomalous energy-decrease of guest atom vibration has been observed for Sr₈Ga₁₆Si _30-xGe_x and Ba₈Ga₁₆Si _30-xGe_x as well as A₈Ga₁₆Ge ₃₀ with decreasing temperature. This result shows that the 4th order anharmonic potential is also important for the guest-ion motion of Sr- and Ba-clathrates. The energy of the guest mode observed by the Raman scattering is consistent with the Einstein temperature estimated by the specific heat measurements. It is confirmed that the off-center rattling plays an important role to suppress the lattice thermal conductivity.

Original language	English
Pages (from-to)	254-256
Number of pages	3
Journal	journal of the physical society of japan
Volume	77
Issue number	SUPPL.A
DOIs	https://doi.org/10.1143/JPSJS.77SA.254
Publication status	Published - 2008
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1143/JPSJS.77SA.254

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@article{8e2297b79aad49cc984c8f35d997ec20,

title = "Raman scattering of type-I clathrate compounds",

abstract = "Rattling motion of a guest ion in type-I clathrate compounds has been studied by Raman scattering measurements. The anomalous energy-decrease of guest atom vibration has been observed for Sr8Ga16Si 30-xGex and Ba8Ga16Si 30-xGex as well as A8Ga16Ge 30 with decreasing temperature. This result shows that the 4th order anharmonic potential is also important for the guest-ion motion of Sr- and Ba-clathrates. The energy of the guest mode observed by the Raman scattering is consistent with the Einstein temperature estimated by the specific heat measurements. It is confirmed that the off-center rattling plays an important role to suppress the lattice thermal conductivity.",

author = "Yuichi Takasu and Takumi Hasegawa and Norio Ogita and Masayuki Udagawa and Avila, {Marcos A.} and Koichiro Suekuni and Toshiro Takabatake",

note = "Funding Information: This work was supported by a Grant-in-Aid for Scientific Research Priority Area “Skutterudite” (no. 15072205) and for COE Research (no. 13CE2002) of the Ministry of Education, Culture, Sports, Science and Technology, Japan. The low temperature experiments are supported by N-BARD of Hiroshima University.",

year = "2008",

doi = "10.1143/JPSJS.77SA.254",

language = "English",

volume = "77",

pages = "254--256",

journal = "Journal of the Physical Society of Japan",

issn = "0031-9015",

publisher = "Physical Society of Japan",

number = "SUPPL.A",

}

TY - JOUR

T1 - Raman scattering of type-I clathrate compounds

AU - Takasu, Yuichi

AU - Hasegawa, Takumi

AU - Ogita, Norio

AU - Udagawa, Masayuki

AU - Avila, Marcos A.

AU - Suekuni, Koichiro

AU - Takabatake, Toshiro

N1 - Funding Information: This work was supported by a Grant-in-Aid for Scientific Research Priority Area “Skutterudite” (no. 15072205) and for COE Research (no. 13CE2002) of the Ministry of Education, Culture, Sports, Science and Technology, Japan. The low temperature experiments are supported by N-BARD of Hiroshima University.

PY - 2008

Y1 - 2008

N2 - Rattling motion of a guest ion in type-I clathrate compounds has been studied by Raman scattering measurements. The anomalous energy-decrease of guest atom vibration has been observed for Sr8Ga16Si 30-xGex and Ba8Ga16Si 30-xGex as well as A8Ga16Ge 30 with decreasing temperature. This result shows that the 4th order anharmonic potential is also important for the guest-ion motion of Sr- and Ba-clathrates. The energy of the guest mode observed by the Raman scattering is consistent with the Einstein temperature estimated by the specific heat measurements. It is confirmed that the off-center rattling plays an important role to suppress the lattice thermal conductivity.

AB - Rattling motion of a guest ion in type-I clathrate compounds has been studied by Raman scattering measurements. The anomalous energy-decrease of guest atom vibration has been observed for Sr8Ga16Si 30-xGex and Ba8Ga16Si 30-xGex as well as A8Ga16Ge 30 with decreasing temperature. This result shows that the 4th order anharmonic potential is also important for the guest-ion motion of Sr- and Ba-clathrates. The energy of the guest mode observed by the Raman scattering is consistent with the Einstein temperature estimated by the specific heat measurements. It is confirmed that the off-center rattling plays an important role to suppress the lattice thermal conductivity.

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EP - 256

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

IS - SUPPL.A

ER -

Raman scattering of type-I clathrate compounds

Abstract

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