Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 363, Issue -, Pages 140-144Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2014.03.052
Keywords
Antiperovskite; Magnetostructural transformation; Mn3GaC
Funding
- Board of Research in Nuclear Sciences (BRNS) [2011/37P/06]
- Department of Science and Technology, India
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Effect of carbon content on magnetostructural transformation in antiperovskites of the type Mn3GaCx (x=0.8, 1.0 and 1.05) has been investigated, It is found that increase in carbon content changes the ground state from ferromagnetic metallic (x=0.8) to antiferromagnetic semiconducting (x=1.05) type. This has been attributed to localization of itinerant Mn 3d electrons due to increased Mn3d - C2p hybridization. Such a hybridization strengthens Mn-C-Mn antiferromagnetic interactions over Mn-Mn ferromagnetic interactions. Further, magnetic field can be used as a tool to modulate the relative strengths of these ferromagnetic and antiferromagnetic interactions thereby affecting the nature and strength of magnetocaloric properties. (C) 2014 Elsevier BY. All rights reserved.
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