Naslov
Theory of valence transition in Ytterbium and Europium intermetallics,

Autori
Zlatić, Veljko ; Freericks, Jim K.

Izvornik
Acta Physica Polonica. B (0587-4254) 32 (2001), 10/I; 3253-3266

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
valence transitions; Ytterbium and Europium intermetallics

Sažetak
The exact solution of the multi-component Falicov-Kimball model in infinite-dimensions is presented and used to discuss a new fixed point of valence fluctuating intermetallics with Yb and Eu ions. In these compounds, temperature, external magnetic field, pressure, or chemical pressure induce a transition between a metallic state with the f-ions in a mixed-valent (non-magnetic) configuration and a semi-metallic state with the f-ions in an integral-valence (paramagnetic) configuration. The zero-field transition occurs at the temperature $T_V$, while the zero-temperature transition sets in at the critical field $H_c$. We present the thermodynamic and dynamic properties of the model for an arbitrary concentration of d- and f-electrons. For large U, we find a MI transition, triggered by the temperature or field-induced change in the f-occupancy.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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