Low Temperature Physics: 37, 847 (2011); https://doi.org/10.1063/1.3671862 (5 pages)
Физика Низких Температур: Том 37, Выпуск 9-10 (Сентябрь 2011), c. 1062-1067 ( к оглавлению , назад )
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
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
Received March 17, 2011
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;
Ключевые слова: intermediate valence, magnetic susceptibility, pressure effect, electronic structure.