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We report on isothermal pulsed (20 ms) field magnetization, temperaturedependent AC - susceptibility, and the static low magnetic field measurementscarried out on 10 nm sized Pr0.5Ca0.5MnO3 nanoparticles (PCMO10). Thesaturation field for the magnetization of PCMO10 (~ 250 kOe) is found to bereduced in comparison with that of bulk PCMO (~300 kOe). With increasingtemperature, the critical magnetic field required to 'melt' the residualcharge-ordered phase decays exponentially while the field transition rangebroadens, which is indicative of a Martensite-like transition. The AC -susceptibility data indicate the presence of a frequency-dependent freezingtemperature, satisfying the conventional Vogel-Fulcher and power laws, pointingto the existence of a spin-glass-like disordered magnetic phase. The presentresults lead to a better understanding of manganite physics and might provehelpful for practical applications.

Martensite-like transition and spin-glass behavior in nanocrystalline Pr0.5Ca0.5MnO3