High-pressure studies on a new superconducting clathrate: Ba6Ge25

Yuan, H. Q.; Grosche, F. M.; Carrillo-Cabrera, W.; Paschen, S.; Sparn, G.; Baenitz, M.; Grin, Y.; Steglich, F.

doi:10.1088/0953-8984/14/44/462

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High-pressure studies on a new superconducting clathrate: Ba₆Ge₂₅

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Yuan, H. Q.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Grosche, F. M.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Carrillo-Cabrera, W.
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Paschen, S.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Sparn, G.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Baenitz, M.
Michael Baenitz, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Grin, Y.
Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Steglich, F.
Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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引用

Yuan, H. Q., Grosche, F. M., Carrillo-Cabrera, W., Paschen, S., Sparn, G., Baenitz, M., Grin, Y., & Steglich, F. (2002). High-pressure studies on a new superconducting clathrate: Ba₆Ge₂₅. Journal of Physics-Condensed Matter, 14(44), 11249-11253. doi:10.1088/0953-8984/14/44/462.

引用: https://hdl.handle.net/11858/00-001M-0000-0015-30D6-0

要旨

The effect of pressure on the low-temperature states of the newly discovered clathrate Ba6Ge25 is investigated by means of measurements of the electrical resistivity. At ambient pressure, Ba6Ge25 undergoes a two-step structural phase transition between 230 and 180 K from metallic behaviour to a high-resistivity state characterized by a mean free path of about 3 A. Interestingly, a Bardeen-Cooper-Schrieffer-like (BCS-like) superconducting transition occurs at T-C approximate to 0.24 K from the resulting 'bad metal'. With increasing pressure, the structural phase transition is depressed but T-C increases drastically. TC reaches a maximum value of 3.85 K at the critical pressure p(C) approximate to 2.8 GPa, where the structural distortion is completely suppressed and the system exhibits metallic behaviour. Higher pressures lead to a slight decrease of T-C.