Observation of large low field magnetoresistance and large magnetocaloric effects in polycrystalline Pr0.65(Ca0.7Sr0.3)0.35MnO3
ABSTRACT Magnetotransport and magnetocaloric properties of polycrystalline Pr 0.65( Ca 0.7 Sr 0.3) Mn O 3 have been studied. Large low field magnetoresistance ( ∼100% at 75 K for 1 T field) with high magnetic field sensitivity (∼5000% T -1) has been observed due to the melting of charge ordered state. The system also shows large magnetocaloric effect at ∼215 and 90 K . The magnetic entropy change is ∼8 and 5.5 J / kg K , respectively, around these temperatures for a field change from 0 to 7 T . Such huge low field magnetoresistance along with large magnetocaloric effect exhibited by the material is interesting from the application point of view.