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Title: Effect of Ru-substitution on electrical and magnetocaloric properties of Nd0.5Ca0.5MnO3
Authors: Krishnamoorthi, C. 
Barik, S.K. 
Mahendiran, R. 
Keywords: A. Manganites
C. Magnetization
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.
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
ISSN: 00381098
DOI: 10.1016/j.ssc.2010.11.015
Appears in Collections:Staff Publications

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