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We present Raman scattering studies of the structural and magnetic phasesthat accompany temperature- and field-dependent melting of charge- andorbital-order (COO) in La0.5Ca0.5MnO3 and La0.25Pr0.375Ca0.375MnO3. Our resultsshow that thermal and field-induced COO melting in La0.5Ca0.5MnO3 exhibitsthree stages in a heterogeneous melting process associated with a structuralchange: a long-range, strongly JT distorted/COO regime; a coexistence regime;and weakly JT distorted/PM or FM phase. We provide a complete structural phasediagram of La0.5Ca0.5MnO3 for the temperature and field ranges 6<=T<=170 K and0<=H<=9 T. We also investigate thermal and field-induced melting inLa0.25Pr0.375Ca0.375MnO3 to elucidate the role of disorder in melting of COO.We find that while thermal melting of COO in La0.25Pr0.375Ca0.375MnO3 is quitesimilar to that in La0.5Ca0.5MnO3, the field-induced transition from the COOphase to the weakly JT-distorted/FM phase in La0.25Pr0.375Ca0.375MnO3 is veryabrupt, and occurs at significantly lower fields (H~2 T at T~0 K) than inLa0.5Ca0.5MnO3 (H~30 T at T=0 K). Moreover, the critical field H_c increaseswith increasing temperature in La0.25Pr0.375Ca0.375MnO3 in contrast toLa0.5Ca0.5MnO3. To explain these differences, we propose that field-inducedmelting of COO in La0.25Pr0.375Ca0.375MnO3 is best described as thefield-induced percolation of FM domains, and we suggest that Griffiths phasephysics may be an appropriate theoretical model for describing the unusualtemperature- and field- dependent transitions observed inLa0.25Pr0.375Ca0.375MnO3.

Raman scattering studies of temperature- and field-induced melting of charge order in (La,Pr,Ca)MnO$_{3}$