Effect of impurity doping at the Mn-site on magnetocaloric effect in Pr0.6Ca0.4Mn0.96B0.04O3 (B=Al, Fe, Cr, Ni, Co, and Ru)
作者： V Suresh Kumar , R Mahendiran , None
DOI: 10.1063/1.3531987
关键词:
摘要: We report the effect of impurity doping at Mn-site on magnetization and magnetic entropy change (ΔSm) in Pr0.6Ca0.4Mn0.96B0.04O3 with B cations having different electronic spin states [B=Al3+(d0), Cr3+(d3), Fe3+(d5), Co2+(d7), Ni2+(d8), Ru4+/5+(d4/3)]. The charge ordered antiferromagnetic insulator Pr0.6Ca0.4MnO3 transforms into a ferromagnetic metal absence an external field (H) for B=Cr, Ni, Co, Ru, whereas B=Fe Al samples remain as insulators. It is found that applied induced abrupt increase above critical value H (field-induced metamagnetic transition) paramagnetic state Co but not B=Ru, which has highest Curie temperature series (TC=205 K). B=Co sample shows maximum (−ΔSm=7.37 J/kg K under ΔH=5 T), followed by −ΔSm=6.77,6.0,5.07,5.04,2.72 J/kg K B=Ni, Cr, Fe, Al, respectively. have also la...
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