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|Title:||Effect of Ru-substitution on electrical and magnetocaloric properties of Nd0.5Ca0.5MnO3||Authors:||Krishnamoorthi, C.
D. Colossal magnetoresistance
E. Magnetocaloric effect
|Issue Date:||Jan-2011||Citation:||Krishnamoorthi, C., Barik, S.K., Mahendiran, R. (2011-01). Effect of Ru-substitution on electrical and magnetocaloric properties of Nd0.5Ca0.5MnO3. Solid State Communications 151 (2) : 107-111. ScholarBank@NUS Repository. https://doi.org/10.1016/j.ssc.2010.11.015||Abstract:||It is shown that the charge-orbital ordered antiferromagnetic insulating state of the parent compound (y=0) in Nd0.5Ca0.5Mn 1-yRuyO3 (y=0, 0.03, 0.05, & 0.10) series is destabilized and a ferromagnetic metallic state is induced by Ru substitution as small as 3%. The ferromagnetic transition temperature (TC) increases with Ru content from 215 K (y=0.03) to 255 K (y=0.10). The magnetic entropy change (ΔSm) of y=0 changes sign from negative to positive as the temperature is lowered below the charge ordering temperature. However, ΔSm is negative and exhibits a peak close to TC in Ru-doped samples. The peak values of ΔSm are -0.33, -3.8, -3.6, and -3.5 J kg-1 K-1 for y=0, 0.03, 0.05, & 0.10 respectively, for a field change of ΔH=5 T. The relative cooling power (RCP) decreases with increasing Ru content from 268 Jkg for x=0.03 to 234 Jkg for x=0.10 for ΔH=5 T whereas the y=0 sample shows 17 Jkg. The large RCP and ΔSm found in Ru-substituted samples will be interesting for magnetic refrigeration below room temperature. © 2010 Elsevier Ltd. All rights reserved.||Source Title:||Solid State Communications||URI:||http://scholarbank.nus.edu.sg/handle/10635/96338||ISSN:||00381098||DOI:||10.1016/j.ssc.2010.11.015|
|Appears in Collections:||Staff Publications|
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