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- Title
Investigation of Mixed Valence State of Sm<sub>1–x</sub>B<sub>6</sub> and m<sub>1–x</sub>La<sub>x</sub>B<sub>6</sub> by XANES.
- Authors
GABÁNI, S.; FLACHBART, K.; BEDNARČÍK, J.; WELTER, E.; FILIPOV, V.; SHITSEVALOVA, N.
- Abstract
We investigated the valence states of samarium ions in Sm deficient Sm1-xB6 (x = 0:03, 0.05, 0.08, 0.1 and 0.2) sintered samples, in single crystalline solid solutions Sm1-xLaxB6 (x = 0:16, 0.28, 0.4, 0.55 and 0.7) as well as in a SmB6 single crystal by X-ray absorption near edge structure (XANES) between 4.2 and 300 K. It was shown that the mixed valence state vSm of Sm-ions (vSm ≈ 2:51 for SmB6 at 4.2 K) in deficient samples is changed but maintained up to a concentration of 20% of vacancies and up to a concentration of 70% in samples doped with trivalent La-ions, and that in both cases it increases with temperature. On the other hand, the value of vSm increases with increasing vacancy level, whereas it decreases with increasing La3+ substitution. The obtained dependences of Sm-valence in SmB6 on vacancy as well as on La3+ ion concentration are in good agreement with susceptibility measurements and exact numerical calculation of the spinless Falicov-Kimball model in two dimensions.
- Subjects
SAMARIUM; X-ray absorption near edge structure; VALENCE (Chemistry); IONS; TEMPERATURE; NUMERICAL calculations
- Publication
Acta Physica Polonica: A, 2014, Vol 126, Issue 1, p338
- ISSN
0587-4246
- Publication type
Article
- DOI
10.12693/APhysPolA.126.338