Universität zu Köln

Gumeniuk, Roman ORCID: 0000-0002-5003-620X, Schnelle, Walter, Ahmida, Mahmoud A., Abd-Elmeguid, Mohsen M., Kvashnina, Kristina O. ORCID: 0000-0003-4447-4542, Tsirlin, Alexander A., Leithe-Jasper, Andreas and Geibel, Christoph (2016). Valence fluctuations of europium in the boride Eu4Pd29+xB8. J. Phys.-Condes. Matter, 28 (11). BRISTOL: IOP PUBLISHING LTD. ISSN 1361-648X

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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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Gumeniuk, Roman UNSPECIFIED orcid.org/0000-0002-5003-620X UNSPECIFIED Schnelle, Walter UNSPECIFIED UNSPECIFIED UNSPECIFIED Ahmida, Mahmoud A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Abd-Elmeguid, Mohsen M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kvashnina, Kristina O. UNSPECIFIED orcid.org/0000-0003-4447-4542 UNSPECIFIED Tsirlin, Alexander A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Leithe-Jasper, Andreas UNSPECIFIED UNSPECIFIED UNSPECIFIED Geibel, Christoph UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-281096
DOI:	10.1088/0953-8984/28/11/115601
Journal or Publication Title:	J. Phys.-Condes. Matter
Volume:	28
Number:	11
Date:	2016
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1361-648X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language X-RAY-ABSORPTION; INTERMETALLIC COMPOUNDS; INTERMEDIATE VALENCE; PHYSICAL-PROPERTIES; CHARGE FLUCTUATIONS; CRYSTAL-STRUCTURES; EU; TRANSITION; MOSSBAUER; YTTERBIUM Multiple languages Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/28109