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  Valence fluctuations of europium in the boride Eu4Pd29+xB8

Gumeniuk, R., Schnelle, W., Ahmida, M. A., Abd-Elmeguid, M. M., Kvashnina, K. O., Tsirlin, A. A., et al. (2016). Valence fluctuations of europium in the boride Eu4Pd29+xB8. Journal of Physics: Condensed Matter, 28(11): 115601, pp. 1-9. doi:10.1088/0953-8984/28/11/115601.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-0981-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-0069-9
Genre: Journal Article

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 Creators:
Gumeniuk, Roman1, Author              
Schnelle, Walter2, Author              
Ahmida, Mahmoud A.3, Author
Abd-Elmeguid, Mohsen M.3, Author
Kvashnina, Kristina O.3, Author
Tsirlin, Alexander A.4, Author              
Leithe-Jasper, Andreas5, Author              
Geibel, Christoph6, Author              
Affiliations:
1Roman Gumeniuk, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863421              
2Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863441              
3External Organizations, ou_persistent22              
4Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
5Andreas Leithe-Jasper, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863406              
6Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              

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 Abstract: We synthesized a high-quality sample of the boride Eu4Pd29+xB8 (x = 0.76) and studied its structural and physical properties. Its tetragonal structure was solved by direct methods and confirmed to belong to the Eu4Pd29B8 type. All studied physical properties indicate a valence fluctuating Eu state, with a valence decreasing continuously from about 2.9 at 5 K to 2.7 at 300 K. Maxima in the T dependence of the susceptibility and thermopower at around 135 K and 120 K, respectively, indicate a valence fluctuation energy scale on the order of 300 K. Analysis of the magnetic susceptibility evidences some inconsistencies when using the ionic interconfigurational fluctuation (ICF) model, thus suggesting a stronger relevance of hybridization between 4f and valence electrons compared to standard valence-fluctuating Eu systems.

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Language(s): eng - English
 Dates: 2016-02-192016-02-19
 Publication Status: Published in print
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Title: Journal of Physics: Condensed Matter
Source Genre: Journal
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Publ. Info: Bristol : IOP Publishing
Pages: - Volume / Issue: 28 (11) Sequence Number: 115601 Start / End Page: 1 - 9 Identifier: ISSN: 0953-8984
CoNE: /journals/resource/954928562478