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Nanto, D.,Zhang Peng,Yong-Yeal Song,Seong-Cho Yu,Telegin, S.,Elochina, L.,Telegin, A. IEEE 2012 IEEE transactions on magnetics Vol.48 No.11
<P>Non-stoichiometric Nd<SUB>0.5</SUB>Sr<SUB>0.5</SUB>MnO<SUB>3</SUB> (NSMO) single crystalline has been grown by the floating zone method. Their magnetic properties, magnetocaloric effect (MCE) and refrigerant capacity (<I>RC</I>) at near both first- and second-order phase transitions were investigated. The NSMO system goes through an antiferomagnetic charge-ordered transition at <I>T</I><SUB>CO</SUB> ~ 152 K followed by a ferromagnetic to paramagnetic transition at <I>T</I><SUB>C</SUB> ~ 272 K. The transition region spread over a broader temperature range at the <I>T</I><SUB>C</SUB> but it had a narrower temperature range at the <I>T</I><SUB>CO</SUB>. The maximum magnetic entropy change Δ<I>S</I><SUB>max</SUB> gives about 1.65 J · kg<SUP>-1</SUP> · K<SUP>-1</SUP> at the first order magnetic transition and -1.13 J · kg<SUP>-1</SUP> · K<SUP>-1</SUP> at the second order magnetic transition, respectively. <I>RC</I> is obtained and it shows much higher value about 34.85 J/kg at <I>T</I><SUB>C</SUB> than the <I>RC</I> 19.06 J/kg at <I>T</I><SUB>CO</SUB>. The slight non-stoichiometric NSMO single crystalline system raises the Curie temperature around 30 K towards room temperature without degradation of the <I>RC</I> and temperature span corresponding to the full width at half maximum of Δ<I>S</I><SUB>max</SUB>(Δ<I>T</I><SUB>FWHM</SUB>) compared to pure single crystalline NSMO system.</P>
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