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  Clathrate Ba6Ge25: Thermodynamic, magnetic, and transport properties

Paschen, S., Tran, V. H., Baenitz, M., Carrillo-Cabrera, W., Grin, Y., & Steglich, F. (2002). Clathrate Ba6Ge25: Thermodynamic, magnetic, and transport properties. Physical Review B, 65(13): 134435, pp. 134435-134435. doi:10.1103/PhysRevB.65.134435.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-3165-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0000-3C8A-2
Genre: Journal Article

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 Creators:
Paschen, S.1, Author              
Tran, V. H.1, Author              
Baenitz, M.2, Author              
Carrillo-Cabrera, W.3, Author              
Grin, Y.4, Author              
Steglich, F.5, Author              
Affiliations:
1Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
2Michael Baenitz, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863471              
3Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
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 recently discovered clathrate Ba6Ge25 undergoes a two-step first-order phase transition at the temperatures T(S1,S2)approximate to215, 180 K. The first-order nature of the transition is evidenced from the hysteretical temperature dependences of the electrical resistivity rho(T), the Hall coefficient R-H(T), and the magnetic susceptibility as well as from the temperature dependence of the specific heat. rho(T) increases drastically below T-S1,T-S2, but the charge-carrier concentration, as determined from R-H(T), is virtually unaffected by the phase transition. Thus, it is the charge- carrier mobility which is strongly reduced below T-S1,T-S2. Taking these observations together with results from a recent structural investigation we conclude that the "locking-in" of "rattling" Ba atoms to off-center positions in the Ge cages is responsible for the mobility reduction of the conduction electrons. It is due to this strong electron-phonon interaction that, while the concept of a "phonon glass" appears to be fulfilled, the concept of an "electron crystal" is heavily violated, in contrast to other filled-cage systems. In the phase Ba6-xEuxGe25 (xless than or equal to0.6), T-S1,T-S2 is quickly suppressed with increasing x and, in Ba4Na2Ge25 [Ba6- xNaxGe25 (x=2)], the locking-in transition is absent alltogether at temperatures below 400 K.

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Language(s): eng - English
 Dates: 2002-04-01
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 17932
ISI: 000174903900111
DOI: 10.1103/PhysRevB.65.134435
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Title: Physical Review B
  Alternative Title : Phys. Rev. B
Source Genre: Journal
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Pages: - Volume / Issue: 65 (13) Sequence Number: 134435 Start / End Page: 134435 - 134435 Identifier: ISSN: 0163-1829