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A detailed analysis of the magnetic properties of a vanthoffite type mineralNa6Mn(SO4)4 basedon dc magnetization, low temperature neutron powderdiffraction and theoretical calculations is reported. The mineral crystallizesin a monoclinic system with space group P21/c, where MnO6 octahedra are linkedvia SO4 tetrahedra. This gives rise to super-exchange interaction between twoMn2+ ions mediated by two nonmagnetic bridging anions and leads to anantiferromagnetic ordering below 3 K. The magnetic structure derived fromneutron powder diffraction at 1.7 K depicts an antiferromagnetic spinarrangement in the bc plane of the crystal. The magnetic properties aremodelled by numerical calculations using exact diagonalization technique, whichfits the experimental results and provides antiferromagnetic ground state ofNa6Mn(SO4)4.

Magnetic structure and properties of a vanthoffite mineral Na6Mn(SO4)4