Publications in Scientific Journals:

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), 311 - 313.

English abstract:
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.


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

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