  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 Tv, while the zero-temperature transition sets in at the
critical field Hc. 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.
