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• W2049898889 abstract "To investigate the off-center rattling motion and its charge-carrier dependence in type-I clathrate compounds, we carried out ultrasonic measurements on type-I Ba${}_{8}$Ga${}_{16}$Sn${}_{30}$ and a reference compound, K${}_{8}$Ga${}_{8}$Sn${}_{38}$. We found elastic softening of ${C}_{44}$ originating from a lattice instability due to the off-center rattling motion of Ba atom in Ba${}_{8}$Ga${}_{16}$Sn${}_{30}$. Elastic softening below 1 K suggests that the lattice instability remains at very low temperatures. We also found ultrasonic dispersion which has no mode selectivity. No-mode-selective ultrasonic dispersion in Ba${}_{8}$Ga${}_{16}$Sn${}_{30}$ would be caused by a strong electron-phonon coupling. No charge-carrier dependence is observed between $n$-type and $p$-type Ba${}_{8}$Ga${}_{16}$Sn${}_{30}$. The significant softening on the bulk modulus in Ba${}_{8}$Ga${}_{16}$Sn${}_{30}$ contrasts to the continuous hardening in K${}_{8}$Ga${}_{8}$Sn${}_{38}$, indicating the central role of the rattling motion in the softening." @default.
• W2049898889 created "2016-06-24" @default.
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• W2049898889 date "2012-02-07" @default.
• W2049898889 modified "2023-10-16" @default.
• W2049898889 title "Lattice instability and elastic dispersion due to the rattling motion in the type-I clathrate Ba<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mn>8</mml:mn></mml:msub></mml:math>Ga<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mn>16</mml:mn></mml:msub></mml:math>Sn<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mrow /><mml:mn>30</mml:mn></mml:msub…" @default.
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• W2049898889 doi "https://doi.org/10.1103/physrevb.85.085101" @default.
• W2049898889 hasPublicationYear "2012" @default.
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