Low Temperature Physics: 37, 847 (2011); https://doi.org/10.1063/1.3671862 (5 pages)
Fizika Nizkikh Temperatur: Volume 37, Number 9-10 (September 2011), p. 1062-1067    ( to contents , go back )

Pressure effect on magnetic properties of valence fluctuating system Ce(Ni1-xCux)5

G.E. Grechnev, A.V. Logosha, A.S. Panfilov, and I.V. Svechkarev

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: grechnev@ilt.kharkov.ua

O. Musil and P. Svoboda

Charles University, Faculty of Mathematics and Physics, Department of Electronic Structures, Ke Karlovu 5, 121 16 Prague 2, The Czech Republic
pos Анотація:

Received March 17, 2011

Abstract

Magnetic susceptibility χ of the isostructural Ce(Ni1–xCux)5 alloys (0 ≤ x ≤ 0.9) was studied as a function of the hydrostatic pressure up to 2 kbar at fixed temperatures 77.3 and 300 K. A pronounced pressure effect on susceptibility is found to be negative in sign and nonmonotonously dependent on the Cu content, showing a sharp maximum at x 0.4. The experimental results are discussed in terms of the valence instability of Ce ion in the studied alloys. For the reference CeNi5 compound the main contributions to χ and their volume dependence are calculated ab initio within the local spin density approximation, and appeared to be in close agreement with experimental data.

PACS: 71.20.Eh Rare earth metals and alloys;
PACS: 75.30.Mb Valence fluctuation, Kondo lattice, and heavy-fermion phenomena;
PACS: 75.80.+q Magnetomechanical effects, magnetostriction.

Key words: intermediate valence, magnetic susceptibility, pressure effect, electronic structure.

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