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arXiv · 1902.06396

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

E. T. Dias·A. Das·A. Hoser·S. Emura·A. K. Nigam·K. R. Priolkar
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Abstract

The volume expanding magnetostructural transition in Mn$_3$GaC and Mn$_3$SnC has been identified to be due to distortion of Mn$_6$C octahedra. Despite a similar lattice volume as Mn$_3$SnC and similar valence electron contribution to the density of states as in Mn$_3$GaC, Mn$_3$InC 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 (EXAFS) reveal 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 Mn$_6$C octahedra produced due to the relatively larger size of In atom compared to Sn and Ga. The size of In atom constricts the deformation of Mn$_6$C octahedra giving rise to Mn -- Mn distances that favor only ferromagnetic interactions in the compound.

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E. T. Dias, A. Das, A. Hoser, S. Emura, A. K. Nigam, K. R. Priolkar. 2019-02-18. Absence of first order magnetic transition, a curious case of Mn3InC. https://doi.org/10.1063/1.5071444

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