Abstract
Mn3GaC and Mn3SnC are two antiperovskites which exhibit a large magnetocaloric effect associated with a magnetostructural transformation. Although structurally similar, the magnetic transition and the nature of magnetocaloric effect in the two compounds is completely different. While Mn3GaC transforms from a ferromagnetic to an antiferromagnetic state at Tt = 178K with the antiferromagnetic propagation vector along K = ½, ½, ½, in Mn3SnC the transformation occurs at Tt = 280K from a paramagnetic state to an antiferromagnetic state with K = ½, ½, 0. Mn K EXAFS has been employed to show that these differences in magnetic properties are related to local structural distortions in Mn6C octahedra which are quite different in the two compounds.
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