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Magnetic, magnetothermal, and magnetotransport properties in SmMn(2)Si(2-x)Ge(x) compounds

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Title Magnetic, magnetothermal, and magnetotransport properties in SmMn(2)Si(2-x)Ge(x) compounds
 
Creator KUMAR, P
SURESH, KG
NIGAM, AK
MALIK, SK
 
Subject magnetocaloric properties
refrigeration
transition
smmn2ge2
entropy
heat
 
Description The effect of Ge substitution for Si in SmMn(2)Si(2-x)Ge(x) compounds has been studied. The Sm ordering temperature is found to be much larger in the compound with x=2, as compared to the compounds with x=0 and 1. The increase in the intralayer Mn-Mn distance is attributed to this variation. Among these three compounds, SmMn(2)Ge(2) is found to show reentrant ferromagnetism at low temperatures. The magnetic contribution to the heat capacity has been calculated in all the three compounds. The splitting of the ground state multiplet has been estimated by fitting the magnetic part of the heat capacity data, using the Schottky formula. The isothermal magnetic entropy change is found to remain the same for x = 0 and 1 but decreases in the compound with x = 2, though the nature of magnetic transition changes from second order to first order, as x is increased from 0. to 2. The electrical resistivity increases with Ge concentration. The excess resistivity in the antiferromagnetic region has been calculated.
 
Publisher AMER INST PHYSICS
 
Date 2011-07-16T09:11:32Z
2011-12-26T12:49:41Z
2011-12-27T05:35:16Z
2011-07-16T09:11:32Z
2011-12-26T12:49:41Z
2011-12-27T05:35:16Z
2008
 
Type Article
 
Identifier JOURNAL OF APPLIED PHYSICS, 103(1), -
0021-8979
http://dx.doi.org/10.1063/1.2828179
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4384
http://hdl.handle.net/10054/4384
 
Language en