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- W1583880648 abstract "The newly‐discovered clathrates Ba6Ge25 and its relatives consist of a rigidG ermanium framework, in which Barium or other metallic atoms are trapped. These ‘guest’ atoms can ‘rattle’ freely in the oversized cages at high temperature. In Ba6Ge25, some of Ba atoms aref rozen into the split positions randomly below 200 K. This structural phase transition results in a two‐step resistivity jump from metallic behavior to semiconductor‐like behavior characterized by a mean free path of 3A. Surprisingly, a BCS‐like superconducting transition occursa t Tc ≈ 0.24 K in such a ‘bad metal’. By applying hydrostatic pressure, the structural phase transition is suppressed but Tc increases drastically. Tc reaches a maximum value of 3.85K at a critical pressure pc ≈ 2.8 GPa, where the structural distortion is completely suppressed and the system exhibits metallic behavior over the whole temperature range. Higher pressures lead to a slight decrease of Tc. On replacing 1/3 of the Ba atoms with Na, no structural phase transi..." @default.
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- W1583880648 date "2002-01-01" @default.
- W1583880648 modified "2023-09-27" @default.
- W1583880648 title "The Novel Superconducting Clathrates: Ba6Ge25 and Na2Ba4Ge25" @default.
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- W1583880648 doi "https://doi.org/10.1063/1.1509149" @default.
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