Order--disorder induced magnetic structures of FeMnP$_{0.75}$Si$_{0.25}$

Details Order--disorder induced magnetic structures of FeMnP$_{0.75}$Si$_{0.25}$ Order--disorder induced magnetic structures of FeMnP$_{0.75}$Si$_{0.25}$

2009-04-15

arxiv.org/abs/0904.2256v1

Phys. Rev. B 83, 134420 (2011)

Physics

Condensed Matter

Materials Science

7 pages, 8 figures, submitted to PRB

Scientific paper

10.1103/PhysRevB.83.134420

We report on the synthesis and structural characterization of the magnetocaloric FeMnP$_{0.75}$Si$_{0.25}$ compound. Two types of samples (as quenched and annealed) were synthesized and characterized structurally and magnetically. We have found that minute changes in the degree of crystallographic order causes a large change in the magnetic properties. The annealed sample, with higher degree of order is antiferromagnetic with a zero net moment. The as-quenched sample has a net moment of 1.26 $\mu_B$/f.u. and ferrimagnetic-like behavior. Theoretical calculations give rather large values for the Fe and Mn magnetic moments, both when occupied on the tetrahedral and pyramidal lattice site. The largest being the Mn moment for the pyramidal site reaches values as high as 2.8 $\mu_B$/atom.

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