Abstract
A scaling behavior between heat capacityCP* and thermal expansion coefficient times temperatureΩTλ, whereλ is a scale factor, is obtained for ferromagneticLa1 − xCaxMnO3 withx = 0.20, 0.25, 0.30, 0.34, 0.40, and 0.45 compounds. The pressure derivative of the magnetic phasetransition temperature obtained through a scaling method is in good agreement withexperimental results for all samples. The critical exponents associated with the specific heat (α) forx = 0.25, 0.30, and 0.34 are very close to the phase boundary where continuous phase transitionsbecome discontinuous. This is attributed to strong coupling among the spin, charge, andlattice degrees of freedom, which indicates that the magnetization alone would be a poorchoice for the order parameter in these systems. Based on thermodynamic arguments, aphase diagram with diverging, cusp-like, near first order, and first order phase transitions ispresented.
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