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  High-pressure studies on a new superconducting clathrate: Ba6Ge25

Yuan, H. Q., Grosche, F. M., Carrillo-Cabrera, W., Paschen, S., Sparn, G., Baenitz, M., et al. (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.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-30D6-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0000-3C85-7
Genre: Journal Article

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 Creators:
Yuan, H. Q.1, Author              
Grosche, F. M.1, Author              
Carrillo-Cabrera, W.2, Author              
Paschen, S.1, Author              
Sparn, G.1, Author              
Baenitz, M.3, Author              
Grin, Y.4, Author              
Steglich, F.5, Author              
Affiliations:
1Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
2Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
3Michael Baenitz, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863471              
4Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863413              
5Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863467              

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 Abstract: 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.

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Language(s): eng - English
 Dates: 2002-11-11
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 18618
ISI: 000179541700162
DOI: 10.1088/0953-8984/14/44/462
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Title: Journal of Physics-Condensed Matter
  Alternative Title : J. Phys.-Condes. Matter
Source Genre: Journal
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Pages: - Volume / Issue: 14 (44) Sequence Number: - Start / End Page: 11249 - 11253 Identifier: ISSN: 0953-8984