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Chemical physics of metallic clathrates with low carrier concentration

MPS-Authors
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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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Bentien,  A.
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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Carrillo-Cabrera,  W.
Chemical Metal Science, 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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Langhammer,  C.
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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Tran,  V. H.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Yuan,  H. Q.
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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Citation

Steglich, F., Bentien, A., Baenitz, M., Carrillo-Cabrera, W., Grosche, F. M., Langhammer, C., et al. (2002). Chemical physics of metallic clathrates with low carrier concentration. Physica B, 318(1), 97-105. doi:10.1016/S0921-4526(02)00781-0.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0015-315B-B
Abstract
We discuss physical properties of two metallic clathrate compounds with low carrier concentration: Eu8Ga16Ge30, the first clathrate known to date, for which the 'guest' sites are fully occupied by 'rattling' lanthanide ions, and Ba6Ge25. Eu(8)Ga(16)G(30) exists in two modifications which both contain divalent Eu ions and order ferromagnetically at low temperatures (T-C = 10.5 K and 36 K, respectively). In Ba6Ge25 some of the 'rattling' Ba atoms lock, perhaps randomly, into split positions near 200 K. A BCS-like superconducting phase transition takes place at T-c = 0.14 K. T-c increases almost 20-fold, as the structural distortion is suppressed under hydrostatic pressure. (C) 2002 Elsevier Science B.V. All rights reserved.