Abstract
The effect of spin dependent f–d interaction (Hund coupling) in mixed-valence phenomena has been investigated within Falicov–Kimball model extended by the spin interaction. Calculations have been performed both at zero and at finite temperatures using exact diagonalization method. It is observed that spin dependent f–d interaction (1) shifts the d-level energy and increases the width of valence transition, (2) increases disorder in the system, (3) causes both single peak and double peak structures to appear in specific heat curves, (4) increases the growth of antiferromagnetic correlations.
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