Softening of phonon by filled rare-earth ion motion common to skutterudite with Sb cages

Kazuaki Iwasa; Yoshiaki Mori; Shohei Itobe; Ryosuke Igarashi; Youichi Murakami; Hitoshi Sugawara; Masahumi Kohgi; Hideyuki Sato

doi:10.1143/JPSJS.80SA.SA032

Softening of phonon by filled rare-earth ion motion common to skutterudite with Sb cages

Kazuaki Iwasa, Yoshiaki Mori, Shohei Itobe, Ryosuke Igarashi, Youichi Murakami, Hitoshi Sugawara, Masahumi Kohgi, Hideyuki Sato

SCI - Physics

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

Abstract

We investigate phonon modes of the rare-earth filled skutterudite compounds CeRu₄sb₁₂, CeOs₄Sb₁₂, PrRu ₄sb₁₂. These materials exhibit similar low-lying motions of filled ions inside the Sb cages that softens with decreasing temperature. Potentials at the rare-earth sites are considerably anharmonic. Despite that this behavior appears in all the four materials, magnitude of the softening of PrOs₄Sb₁₂ is largest among them. This fact implies that difference of carrier state gives rise to renormalization effect on the rare-earth-ion vibrations.

Original language	English
Article number	SA032
Journal	journal of the physical society of japan
Volume	80
Issue number	SUPPL. A
DOIs	https://doi.org/10.1143/JPSJS.80SA.SA032
Publication status	Published - 2011 Jul

Keywords

Anharmonicity
Cage structure
Neutron scattering
Phonon

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1143/JPSJS.80SA.SA032

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Softening of phonon by filled rare-earth ion motion common to skutterudite with Sb cages. / Iwasa, Kazuaki; Mori, Yoshiaki; Itobe, Shohei; Igarashi, Ryosuke; Murakami, Youichi; Sugawara, Hitoshi; Kohgi, Masahumi; Sato, Hideyuki.

In: journal of the physical society of japan, Vol. 80, No. SUPPL. A, SA032, 07.2011.

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

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title = "Softening of phonon by filled rare-earth ion motion common to skutterudite with Sb cages",

abstract = "We investigate phonon modes of the rare-earth filled skutterudite compounds CeRu4sb12, CeOs4Sb12, PrRu 4sb12. These materials exhibit similar low-lying motions of filled ions inside the Sb cages that softens with decreasing temperature. Potentials at the rare-earth sites are considerably anharmonic. Despite that this behavior appears in all the four materials, magnitude of the softening of PrOs4Sb12 is largest among them. This fact implies that difference of carrier state gives rise to renormalization effect on the rare-earth-ion vibrations.",

keywords = "Anharmonicity, Cage structure, Neutron scattering, Phonon",

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AU - Iwasa, Kazuaki

AU - Mori, Yoshiaki

AU - Itobe, Shohei

AU - Igarashi, Ryosuke

AU - Murakami, Youichi

AU - Sugawara, Hitoshi

AU - Kohgi, Masahumi

AU - Sato, Hideyuki

PY - 2011/7

Y1 - 2011/7

N2 - We investigate phonon modes of the rare-earth filled skutterudite compounds CeRu4sb12, CeOs4Sb12, PrRu 4sb12. These materials exhibit similar low-lying motions of filled ions inside the Sb cages that softens with decreasing temperature. Potentials at the rare-earth sites are considerably anharmonic. Despite that this behavior appears in all the four materials, magnitude of the softening of PrOs4Sb12 is largest among them. This fact implies that difference of carrier state gives rise to renormalization effect on the rare-earth-ion vibrations.

AB - We investigate phonon modes of the rare-earth filled skutterudite compounds CeRu4sb12, CeOs4Sb12, PrRu 4sb12. These materials exhibit similar low-lying motions of filled ions inside the Sb cages that softens with decreasing temperature. Potentials at the rare-earth sites are considerably anharmonic. Despite that this behavior appears in all the four materials, magnitude of the softening of PrOs4Sb12 is largest among them. This fact implies that difference of carrier state gives rise to renormalization effect on the rare-earth-ion vibrations.

KW - Anharmonicity

KW - Cage structure

KW - Neutron scattering

KW - Phonon

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Softening of phonon by filled rare-earth ion motion common to skutterudite with Sb cages

Abstract

Keywords

ASJC Scopus subject areas

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