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We explain the observed specific heat anomaly (and hence entropy change) inthe colossal magnetoresistive manganite Sm0.55Sr0.45MnO3, by introducing phaseseparation into the current carrier density collapse theory via the notion ofthe ferromagnetic volume fraction. Within the same framework, we have also beenable to explain the observed electrical resistivity of Sm0.55Sr0.45MnO3 byusing appropriate expressions governing the scattering mechanisms far away fromthe transition. Fitting specific heat and resistivity results has allowed us toseparate the hopping activation energy of polaronic carriers and the bipolaronbinding energy contributions to the exponential behaviour of resistivity in theparamagnetic phase.

Mapping Colossal Magnetoresistance Phase Transitions with the Charge-Carrier Density Collapse Model