Role of Tin and Carbon in the magnetic interactions in Mn${}_3$SnC

Abstract

In this paper we attempt to understand the role of tin and carbon in magnetic interactions in Mn${}_3$SnC. Mn${}_3$SnC exhibits a time dependent magnetic configuration and a complex magnetic ground state with both ferromagnetic and antiferromagnetic orders. Such a magnetic state is attributed to presence of distorted Mn${}_6$C octahedra with long and short Mn--Mn bonds. Our studies show that C deficiency increases the tensile strain on the Mn${}_6$C octahedra which elongates Mn--Mn bonds and strengthens ferromagnetic interactions while Sn deficiency tends to ease out the strain resulting in shorter as well as longer Mn--Mn bond distances in comparison with stoichiometric Mn${}_3$SnC. Such a variation strengthens both, ferromagnetic and antiferromagnetic interactions. Thus the structural strain caused by both Sn and C is responsible for complex magnetic ground state of Mn${}_3$SnC.

arXiv commentAccepted in JMMM

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Cited by in corpus (2)

• Modulations in magnetostructural coupling in C and Sn deficient Mn${}_3$SnC
• $d$ band filling and magnetic phase separation in transition metal-doped Mn${}_3$SnC