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Effect of Ge substitution for Si on the anomalous magnetocaloric and magnetoresistance properties of GdMn2Si2 compounds

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Title Effect of Ge substitution for Si on the anomalous magnetocaloric and magnetoresistance properties of GdMn2Si2 compounds
 
Creator KUMAR, P
SINGH, NK
SURESH, KG
NIGAM, AK
MALIK, SK
 
Subject magnetic phase-transitions
resistivity
dependence
heat
 
Description The effect of Ge substitution on the magnetization, heat capacity, magnetocaloric effect, and magnetoresistance of GdMn2Si2-xGex (x=0, 1, and 2) compounds has been studied. The magnetic transition associated with the Gd ordering is found to change from second order to first order on Ge substitution. Magnetic contributions to the total heat capacity and the entropy have been estimated. Magnetocaloric effect has been calculated in terms of adiabatic temperature change (Delta T-ad) as well as isothermal magnetic entropy change (Delta S-M) using the heat capacity data. The temperature dependence of the magnetocaloric effect in all the three compounds have shown broad peaks. The maximum values of Delta S-M and Delta T-ad for GdMn2Ge2 are found to be 5.9 J/kg K and 1.2 K, respectively. The magnetoresistance is found to be very large and positive with a maximum value of about 22% in the case of GdMn2Ge2. In the other two compounds also, the magnetoresistance is predominantly positive, except in the vicinity of the Gd ordering temperature. The anomalous nature of the magnetocaloric effect and the magnetoresistance has been attributed to the canted magnetic structure of these compounds. (c) 2007
 
Publisher AMER INST PHYSICS
 
Date 2011-07-15T15:52:02Z
2011-12-26T12:49:34Z
2011-12-27T05:34:46Z
2011-07-15T15:52:02Z
2011-12-26T12:49:34Z
2011-12-27T05:34:46Z
2007
 
Type Article
 
Identifier JOURNAL OF APPLIED PHYSICS, 101(1), -
0021-8979
http://dx.doi.org/10.1063/1.2402975
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4320
http://hdl.handle.net/10054/4320
 
Language en