[Zurück]

M. El-Hagary, H. Michor, E. Bauer, R. Grössinger, P. Kerschl, D. Eckert, K.-H. Müller, P. Rogl, G. Giester, G. Hilscher:
"Intermediate valence behavior in CeCo₉Si₄*";
Physica B: Condensed Matter, 359-361 (2005), S. 311 - 313.

Intermediate valence behavior in CeCo₉Si₄*

M. El-Hagary a, H. Michor a, E. Bauer a, R. Grössinger a, P. Kerschl b, D. Eckert b, K.-H. Müller b, P. Rogl c, G. Giester d and G. Hilscher a

a Institut für Festkörperphysik, Wiedner Hauptstrasse 8-10, T.U. Wien, A-1040 Wien, Austria
b Leibniz-Institut für Festköper- und Werkstoffforschung, IFW Dresden, D-01171 Dresden, Germany
c Institut für Physikalische Chemie, Universität Wien, A-1090 Wien, Austria
d Institut für Mineralogie und Kristallographie, Universität Wien, A-1090 Wien, Austria

Available online 12 February 2005.

Abstract

The novel ternary compound CeCo₉Si₄ has been studied by means of specific heat, magnetization and transport measurements. Single-crystal X-ray refinements reveal a fully ordered distribution of Ce, Co and Si atoms with the tetragonal space group I4/mcm isostructural with other RCo₉Si₄. The smaller lattice constants of CeCo₉Si₄ in comparison with the trend established by other RCo₉Si₄ is indicative for intermediate valence of cerium. While RCo₉Si₄ with R=Pr,...Tb, and Y show ferromagnetism and LaCo₉Si₄ is nearly ferromagnetic, CeCo₉Si₄ remains paramagnetic even in external fields as large as 40 T, though its electronic specific heat coefficient (γ ~ 190 mJ/mol K²) is of similar magnitude as that of metamagnetic LaCo₉Si₄ and weakly ferromagnetic YCo₉Si₄.

Keywords: CeCo₉Si₄; Intermediate valence; High-field measurement

PACS: 61.66.-f; 65.40.-b; 71.28.+d

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC05937917

http://dx.doi.org/10.1016/j.physb.2005.01.117