A comparison of magnetocaloric effect in Pr(0.6)A(0.4)Mn(1-x)Cr(x)O(3) (A = Ca and Sr; x=0 and 0.04)

作者：Kumar V Suresh; Mahendiran R^*

来源：Solid State Communications, 2010, 150(31-32): 1445-1449.

DOI：10.1016/j.ssc.2010.05.027

• Manganites
• Magnetocaloric effect
• Magnetoresistance
• Magnetization

In this work, we compare and contrast electrical, magnetic and magnetocaloric properties of undoped (x = 0) and 4% Cr-doped Pr(0.6)A(0.4)Mn(1-x)Cr(x)O(3) (A = Ca and Sr). It is shown that while Cr-doping in A = Ca transforms the charge ordered antiferromagnetic insulator into a ferromagnetic metal, it decreases the ferromagnetic transition temperature (T-C) and magnetic moment for A = Sr. The change in magnetic entropy, Delta S-m = -5.99 J/kg K for Delta H = 5 T around T-C = 155 K of x = 0.04 and A = Ca is superior to that of x = 0.04 and A = Sr (Delta S-m = -2.08 J/kg K at T-C = 290 K). The large magnetic entropy in Pr0.6Ca0.4Mn0.96Cr0.04O3 is attributed to the field-induced suppression of short-range charge-orbital ordering and antiferromagnetic fluctuations present above T-C. Our results indicate that Cr substitution in charge ordered manganites is one of the possible ways to enhance magnetocaloric effect in these complex oxides.

• 出版日期2010-8