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2014 | 126 | 1 | 338-339
Article title

Investigation of Mixed Valence State of Sm_{1-x}B_{6} and Sm_{1-x}La_{x}B_{6} by XANES

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EN
Abstracts
EN
We investigated the valence states of samarium ions in Sm deficient Sm_{1-x}B_{6} (x=0.03, 0.05, 0.08, 0.1 and 0.2) sintered samples, in single crystalline solid solutions Sm_{1-x}La_{x}B_{6} (x=0.16, 0.28, 0.4, 0.55 and 0.7) as well as in a SmB_{6} single crystal by X-ray absorption near edge structure (XANES) between 4.2 and 300 K. It was shown that the mixed valence state v_{Sm} of Sm-ions (v_{Sm} ≈ 2.51 for SmB_{6} 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 v_{Sm} increases with increasing vacancy level, whereas it decreases with increasing La^{3+} substitution. The obtained dependences of Sm-valence in SmB_{6} on vacancy as well as on La^{3+} ion concentration are in good agreement with susceptibility measurements and exact numerical calculation of the spinless Falicov-Kimball model in two dimensions.
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EN
Contributors
author
  • Centre of Low Temp. Physics, Institute of Experimental Physics SAS, Watsonova 47, 04001 Košice, Slovakia
author
  • Centre of Low Temp. Physics, Institute of Experimental Physics SAS, Watsonova 47, 04001 Košice, Slovakia
  • Deutsches Elektronen Synchrotron DESY, Notkestrasse 85, 22603 Hamburg, Germany
author
  • Deutsches Elektronen Synchrotron DESY, Notkestrasse 85, 22603 Hamburg, Germany
author
  • Institute for Problems of Materials Science, NASU, Krzhyzhanovsky 3, 03680 Kiev, Ukraine
  • Institute for Problems of Materials Science, NASU, Krzhyzhanovsky 3, 03680 Kiev, Ukraine
References
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv126n1163kz
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