Ferromagnetic ordering in the MMnF6 series (M = Ni, Cu, Zn, Pd)

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Abstract

Neutron diffraction experiments performed on MMnF6 compounds (M = Ni, Cu, Zn, Pd) have shown that both NiMnF6 and ZnMnF6 crystallize in the rhombohedral R3 space group with a cationic ordering, whereas PdMnF6 shows cationic disordering (R3c, a = 5.46 Å, α = 54.45°). CuMnF6 has a monoclinic distortion derived from the MnF3 structural type (a = 8.57 Å, b = 4.85 Å, c = 13.46 Å, β = 92.12°). The magnetic properties can be correlated with the structure: the R3 ordered compounds show a ferromagnetic behavior (TC(NiMnF6) = 39 K; TC(ZnMnF6) = 9.5 K; TC(CdMnF6) = 8 K), while the other two have an antiferromagnetic ordering.

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