Publications in Scientific Journals:

H. Michor, E. Bauer, M. El-Hagary, C. Dusek, P. Rogl, G. Hilscher:
"Kondo-lattice behaviour of CeNi9Si4";
Physica B: Condensed Matter, 329-333 (2003), 572 - 573.

English abstract:
Kondo-lattice behaviour of CeNi9Si4

H. Michora, E. Bauera, M. El-Hagarya, C. Duseka, P. Roglb and G. Hilscher [Corresponding Author Contact Information] , [E-mail The Corresponding Author] , a

a Institut für Festkörperphysik, Technische Universität Wien, A-1040, Wien, Austria
b Institut für Physikalische Chemie, Universität Wien, A-1090, Wien, Austria

Available online 15 March 2003.


We have studied the crystal chemistry, thermodynamic and transport properties of ternary compounds RNi9Si4 with R=La and Ce. The Rietveld refinement of the X-ray diffraction pattern revealed a tetragonal crystal structure (space group I4/mcm) that is derived from the cubic NaZn13 structure type. In the case of CeNi9Si4 resistivity, magnetic susceptibility and specific heat measurements reveal Kondo-lattice behaviour with a T2 temperature dependence of the electrical resistivity, an enhanced Pauli susceptibility [small chi, Greek] 0=510-3 emu/mol and a Sommerfeld value [small gamma, Greek] =155 (5) mJ/molK2 . The magnetic susceptibility and specific heat contribution is well described by the Coqblin?Schrieffer model with a fully degenerate J=5/2 ground state and a characteristic temperature T0 [similar, equals] 180 K. LaNi9Si4 exhibits simple Pauli paramagnetic, metallic behaviour with a Sommerfeld value [small gamma, Greek] =33 mJ/molK2.

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