Valence transition behavior of the doped Falicov-Kimball model at nonzero temperaturesReportar como inadecuado



 Valence transition behavior of the doped Falicov-Kimball model at nonzero temperatures


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The extrapolation of small-cluster exact-diagonalization calculations is used to study the influence of doping on valence transitions in the spinless Falicov-Kimball model at nonzero temperatures. Two types of doping are examined, and namely, the substitution of rare-earth ions by non-magnetic ions that introduce i one or ii none additional electron per non-magnetic ion into the conduction band. It is found that the first type of substitution increases the average $f$-state occupancy of rare-earth ions, whereas the second type of substitution has the opposite effect. The results obtained are used to describe valence transition behavior of samarium in the hexaboride solid solutions $Sm {1-x}M xB 6$ $M=Y^{3+},La^{3+}, Sr^{2+},Yb^{2+}$ and a very good agreement of theoretical and experimental results is found.



Autor: Pavol Farkasovsky

Fuente: https://archive.org/







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