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The heat capacity of single-crystalline samples of Sr8Ga16Ge30 (SGG) and Ba8Ga16Ge30 (BGG) clathrates was measured to investigate the anharmonicity of the encapsulated atoms. At low temperatures, BGG can be well described by a standard Debye model, and the Cp/T3 versus T plot can be fitted with two Einstein temperatures: θE1 = 42 K and θE2 = 74 K. On the other hand, SGG shows deviation from the...
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