Absence of first order magnetic transition, a curious case of Mn3InC

The volume expanding magnetostructural transition in Mn3GaC and Mn3SnC has been identified to be due to distortion of Mn6C octahedra. Despite a similar lattice volume as Mn3SnC and similar valence electron contribution to density of states as in Mn3GaC, Mn3InC does not undergo a first order magnetos...

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Bibliographic Details
Published in:Journal of applied physics 2019-02, Vol.125 (6)
Main Authors: Dias, E. T., Das, A., Hoser, A., Emura, S., Nigam, A. K., Priolkar, K. R.
Format: Article
Language:English
Subjects:
Crystals
Deformation
Ferromagnetism
Fine structure
Magnetic moments
Magnetic properties
Magnetic transitions
Magnetism
Neutron diffraction
X ray absorption
X-ray diffraction
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Summary:The volume expanding magnetostructural transition in Mn3GaC and Mn3SnC has been identified to be due to distortion of Mn6C octahedra. Despite a similar lattice volume as Mn3SnC and similar valence electron contribution to density of states as in Mn3GaC, Mn3InC does not undergo a first order magnetostructural transformation like the Ga and Sn antiperovskite counterparts. A systematic investigation of its structure and magnetic properties using probes like x-ray diffraction, magnetization measurements, neutron diffraction, and extended x-ray absorption fine structure reveals that though the octahedra are distorted resulting in long and short Mn–Mn bonds and different magnetic moments on Mn atoms, the interaction between them remains ferromagnetic. This has been attributed to the strain on the Mn6C octahedra produced due to a relatively larger size of In atoms compared to Sn and Ga. The size of In atoms constricts the deformation of Mn6C octahedra giving rise to Mn–Mn distances that favor only ferromagnetic interactions in the compound.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.5071444