Phase separation and effect of strain on magnetic properties of Mn3Ga1−xSnxC

While the unit cell volume of compounds belonging to the Mn3Ga1−xSnxC (0 ≤x≤ 1) series shows a conformity with Vegard’s law, their magnetic and magnetocaloric properties behave differently from those of parent compounds Mn3GaC and Mn3SnC. A correlation between the observed magnetic properties and un...

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Bibliographic Details
Published in:Journal of applied physics 2018-10, Vol.124 (15)
Main Authors: Dias, E. T., Das, A., Hoser, A., Emura, S., Nigam, A. K., Priolkar, K. R.
Format: Article
Language:English
Subjects:
Applied physics
Compressive properties
Magnetic properties
Magnetism
Phase separation
Solid solutions
Unit cell
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Summary:While the unit cell volume of compounds belonging to the Mn3Ga1−xSnxC (0 ≤x≤ 1) series shows a conformity with Vegard’s law, their magnetic and magnetocaloric properties behave differently from those of parent compounds Mn3GaC and Mn3SnC. A correlation between the observed magnetic properties and underlying magnetic and local structure suggests that replacing Ga atoms by larger atoms of Sn results in the formation of Ga-rich and Sn-rich clusters. As a result, even though the long range structure appears to be cubic, Mn atoms find themselves in two different local environments. The packing of these two different local structures into a single global structure induces tensile/compressive strains on the Mn6C functional unit and is responsible for the observed magnetic properties across the entire solid solution range.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.5050655