Peculiarities of the intermediate valence state of Ce in CeM2Si2 (M = Fe, Co, Ni) compounds

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作者：
Koterlyn, M. [1 ,3 ]
Shcherba, I. [2 ]
Yasnitskii, R. [3 ]
Koterlyn, G. [4 ]
机构：
[1] Department of Physics, K. Wielkiego University, Weyssenhoffa Sq. 11, 85-072 Bydgoszcz, Poland
[2] Institute of Technology, Pedagogical University, Podchorazych Str. 2, 30-084 Cracow, Poland
[3] Institute of Electronics, Ivan Franko National University of L'viv, Dragomanova Str. 50, 79005 L'viv, Ukraine
[4] Western Scientific Center, National Academy of Sciences, Ministry of Education and Science of Ukraine, Matejka Str. 4, 79000 L'viv, Ukraine
来源：
Journal of Alloys and Compounds | 2007年 / 442卷 / 1-2 SPEC. ISS.期
关键词：
The results of thermoelectric power and the electrical resistivity measurements connected with the intermediate valence (IV) of Ce are presented for the compounds CeM2Si2 (M = Fe; Co; Ni) in the temperature range of 4-800 K. It is shown that CeM2Si2 are Kondo-lattices with the coherence scale Tcoh ∼ 60-80 K and the so-called single-site Kondo temperature TK ∼ 103 K. On the example of CeNi2Si2 we have studied the changes in the structure of density of f states (f-DOS) near the Fermi energy caused by atomic substitutions. The results of structural; transport; magnetic; and Ce LIII X-ray absorption spectra measurements in the series Ce1-xLaxNi2Si2 (0 &le x &le 0.6); Ce(Ni1-yCuy)2Si2 (0 &le y &le 0.6) and CeNi2(Si1-zGez)2 (0 &le z &le 0.5) are presented. We found that the IV state of Ce in the CeM2Si2 is an evidence of possible opening a wide pseudogap Δ ∼ kTK within the f-DOS structure slightly above the Fermi energy. © 2007 Elsevier B.V. All rights reserved;
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