Please use this identifier to cite or link to this item:
|Title:||Composition dependence of magnetocaloric effect in Pr 0.6Ca 0.4Mn 1-xCr xO 3 (x = 0.02-0.08)|
|Citation:||Kumar, V.S., Mahendiran, R. (2012). Composition dependence of magnetocaloric effect in Pr 0.6Ca 0.4Mn 1-xCr xO 3 (x = 0.02-0.08). Journal of Nanoscience and Nanotechnology 12 (1) : 573-577. ScholarBank@NUS Repository. https://doi.org/10.1166/jnn.2012.5390|
|Abstract:||We report the effect of varying Cr content on magnetic and magnetocaloric properties of Pr 0.6Ca 0.4Mn 1-xCr xO 3 samples (x = 0, 0.02, 0.04, 0.06 and 0.08). While the parent compound (x =0) is a charge ordered and antiferromagnetic insulator, Cr doped compounds are ferromagnetic metals with nearly same Curie temperature (T C ≈ 140 K). We find unusual field-induced metamagnetic transition above T C in x = 0.02 and 0.04 which is absent in x = 0.06 and 0.08. It is suggested that the paramagnetic phase in these compounds is inhomogeneous with coexistence of nano-size ferromagnetic clusters and short range charge ordered clusters. Field induced growth of ferromagnetic nano-clusters and destruction of short-range charge ordering leads to the observed metamagnetic transition, which results in large magnetic entropy change of -ΔS M =5.043, 6, 5.509 and 4.375 J/kg K under ΔH =5 T, for x = 0.02, 0.04, 0.06 and 0.08, respectively. In addition, large relative cooling power (RCP) found in these materials (327.384, 286.36, 272.22 and 279.936 J/kg) makes it interesting for practical applications. Our study suggests that creation of ferromagnetic nano-clusters in the paramagnetic phase by Mn-site doping in charge ordered compounds provides an alternative approach to achieve high ΔS M and RCP values. Copyright © 2012 American Scientific Publishers.|
|Source Title:||Journal of Nanoscience and Nanotechnology|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Jul 14, 2018
WEB OF SCIENCETM
checked on Jun 19, 2018
checked on Jul 6, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.