  Existing experimental data for various colossal magnetoresistance manganites
have been examined employing an ovesimplified model that roots in 1970th. This
model considers a classical semiconductor where conducting bands are affected
by the strong Weiss exchange field that arises from the magnetic order in the
substance. The field--caused shifts of the conducting bands results in the
change in the number of thermally activated carriers, and this change is
presumed to be responsible for the resistivity dependences on temperature and
magnetic field and for the CMR itself. Employing this model we calculate this
hypothetical Weiss field from the experimental data for various CMR manganites
employing minimal set of the adjustable parameters, namely two. The obtained
Weiss field behaves with temperature and external field similarly to the local
magnetization, its supposed source, hence supporting the model.

Strongly Correlated Electrons