Publications in Scientific Journals:

H. Michor, E. Bauer, M. El-Hagary, G. Hilscher, P. Rogl:
"Heavy Electron Behaviour of CeNi9Si4";
Acta Physica Polonica B, 34 (2003), 955 - 958.

English abstract:
Heavy Electron Behaviour of CeNi9Si4
H. Michor, E. Bauer, M. El-Hagary, G. Hilscher, P. Rogl

We have studied the phase formation, thermodynamic and transport properties of CeNi9Si4. The Rietveld refinement of the X-ray pattern confirms a fully ordered tetragonal crystal structure (space group I4/mcm) that is derived from the cubic NaZn13 structure type. Resistivity, magnetic susceptibility and specific heat measurements reveal Kondo-lattice behaviour with an enhanced Pauli susceptibility \chi 0=0.005 emu/mol and a large Sommerfeld value \gamma = 155 (5) mJ/molK2. The magnetic contributions to the specific heat and the magnetic susceptibility are well described by the Coqblin--Schrieffer model with a fully degenerate J = 5/2 ground state and a characteristic temperature T0\simeq 180 K.

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