Please use this identifier to cite or link to this item:
Title: Normal and inverse magnetocaloric effects in La0:5Ca 0:5Mn1-xNixO3
Authors: Krishnamoorthi, C. 
Barik, S.K. 
Siu, Z.
Mahendiran, R. 
Keywords: A. Manganites
C. Magnetization
D. Magnetocaloric effect
D. Metamagnetic transition
Issue Date: Sep-2010
Source: Krishnamoorthi, C., Barik, S.K., Siu, Z., Mahendiran, R. (2010-09). Normal and inverse magnetocaloric effects in La0:5Ca 0:5Mn1-xNixO3. Solid State Communications 150 (35-36) : 1670-1673. ScholarBank@NUS Repository.
Abstract: We have investigated magnetic and magnetocaloric properties of La 0.5Ca0.5Mn1-xNixO3 (x=0, 0.02, 0.04, 0.06, & 0.08). It is shown that charge-ordered antiferromagnetic ground state of x=0 is destabilized and ferromagnetism is induced by just 2% Ni substitution. The ferromagnetic Curie temperature (TC) decreases from TC=220K for x=0 to 85K (x=0.08). Unusual field-induced metamagnetic transition is found above TC for x=0.02-0.06 and even below TC in the parent compound (x=0). Magnetic entropy change (ΔSm) was estimated from isothermal magnetization data and it is found that the parent compound (x=0) exhibits both normal (negative ΔSm) and inverse (positive ΔSm) magnetocaloric effects at TC and TN (Neel temperature), respectively. The ΔSm=+6.5Jkg-1K-1 at TN is twice larger than that at TC(ΔSm=-3Jkg-1K-1) for a field change (ΔH) of 5T. However, all the Ni doped samples in La0.5Ca 0.5Mn1-xNixO3 system show only normal magnetocaloric effect at TC. The largest MCE in the Ni doped series occurs for x=0.04(ΔSm=-3.9Jkg-1K-1,ΔH=5T) which also has the largest relative cooling power (RCP=235J/kg,ΔH=5T) in the series. We discuss our results in the scenario of phase separation induced by Ni substitution. © 2010 Elsevier Ltd. All rights reserved.
Source Title: Solid State Communications
ISSN: 00381098
DOI: 10.1016/j.ssc.2010.06.028
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Mar 8, 2018


checked on Feb 7, 2018

Page view(s)

checked on Mar 12, 2018

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.