锡和碳在Mn $_3$ SnC磁性相互作用中的作用
Role of Tin and Carbon in the magnetic interactions in Mn$_3$SnC
摘要：
在本文中，我们试图了解的作用，锡和碳的磁性相互作用在锰$_3$ SnC。Mn $_3$ SnC具有随时间变化的磁结构和复杂的磁基态，同时具有铁磁和反铁磁两种磁序.这种磁性状态归因于存在具有长和短Mn-Mn键的扭曲Mn $_6$ C八面体。我们的研究表明，C的缺乏增加了拉伸应变的Mn $_6$ C八面体，延长Mn-Mn键和加强铁磁相互作用，而Sn的缺乏往往会缓解的应变，导致更短以及更长的Mn-Mn键的距离相比，化学计量的Mn $_3$ SnC。这种变化加强了铁磁和反铁磁相互作用。因此，由Sn和C引起的结构应变负责Mn $_3$ SnC的复杂磁基态。
英文摘要：
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.
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