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Non-stoichiometric Nd0.5Sr0.5MnO3 (NSMO) single crystalline has been grown by the floating zone method. Their magnetic properties, magnetocaloric effect (MCE) and refrigerant capacity (RC) at near both first- and second-order phase transitions were investigated. The NSMO system goes through an antiferomagnetic charge-ordered transition at TCO ~ 152 K followed by a ferromagnetic to paramagnetic transition at TC ~ 272 K. The transition region spread over a broader temperature range at the TC but it had a narrower temperature range at the TCO. The maximum magnetic entropy change ΔSmax gives about 1.65 J · kg-1 · K-1 at the first order magnetic transition and -1.13 J · kg-1 · K-1 at the second order magnetic transition, respectively. RC is obtained and it shows much higher value about 34.85 J/kg at TC than the RC 19.06 J/kg at TCO. The slight non-stoichiometric NSMO single crystalline system raises the Curie temperature around 30 K towards room temperature without degradation of the RC and temperature span corresponding to the full width at half maximum of ΔSmax(ΔTFWHM) compared to pure single crystalline NSMO system.
Date of Publication: Nov. 2012