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Existing experimental data for various colossal magnetoresistance manganiteshave been examined employing an ovesimplified model that roots in 1970th. Thismodel considers a classical semiconductor where conducting bands are affectedby the strong Weiss exchange field that arises from the magnetic order in thesubstance. The field--caused shifts of the conducting bands results in thechange in the number of thermally activated carriers, and this change ispresumed to be responsible for the resistivity dependences on temperature andmagnetic field and for the CMR itself. Employing this model we calculate thishypothetical Weiss field from the experimental data for various CMR manganitesemploying minimal set of the adjustable parameters, namely two. The obtainedWeiss field behaves with temperature and external field similarly to the localmagnetization, its supposed source, hence supporting the model.

Naive model from 1970th applied to CMR manganites: it seems to work