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We report a comprehensive investigation of La0.2Pr0.4Ca0.4MnO3 to clarify themicrometre scale phase separation phenomenon in the mixed valent manganite(La,Pr,Ca)MnO3. The compound shows multiple magnetic transitions, in which thecharge-ordered state is converted into a ferromagnetic state in steps with theapplication of a magnetic field. The ac susceptibility measurements show thatthe glassy transition at low temperatures does not depend on the frequency,thus indicating the absence of any spin glass behaviour. Magnetization as wellas heat capacity measurements indicate that this low temperature transition ismagnetic field dependent. The field dependent resistivity at 2K shows a sharpdrop indicating that the sample behaviour changes from a high resistive stateto a low resistive state, corroborating the conversion of charge-orderedinsulating (COI) phase to a ferromagnetic metallic (FMM) phase. Our resultspoint towards the existence of phase separation, rigidity of the lowtemperature glassy-like phase as well as the conversion of COI phase to FMMphase by the application of magnetic fields.

Investigation of the phase separation property in La$_{0.2}$Pr$_{0.4}$Ca$_{0.4}$MnO$_3$ manganite