Large magnetoresistance and spin glass behavior of nanocrystalline La0.48Ca0.52MnO3 compound at low temperature

In this present study we report the large magnetoresistance and spin glass behavior of nanocrystalline La0.48Ca0.52MnO3 compound having average particle size 25 nm. Our experimental study reveals that in contrast to the bulk counterpart, the charge ordered antiferromagnetic ground state of the compound is totally suppressed and ferromagnetism part predominant. In addition to that, a spin glass like transition appears at the low temperature (∼42 K). Such glassy nature of the frozen spins influence the magnetoresistive properties of this compound also. Low field magnetoresistance at the low temperature of this compound is analyzed considering the correlation between the ferromagnetic clusters formed inside the grains.