Abstract
The antiferromagnetic structures of both the manganese and europium sublattices in EuMn2Ge2 have been determined using thermal neutron diffraction. TN(Mn) = 714(5) K with the 3.35(5) (at 285 K) Mn moments ordering according to the space group. The Eu order is incommensurate with the 6.1(2) (at 3.6 K) Eu moments oriented parallel to the c-axis with a propagation vector of k = [0.153(2) 0 0]. Both neutron diffraction and 151Eu Mössbauer spectroscopy reveal evidence of magnetic short-range ordering of the Eu sublattice around and above TN(Eu) ∼ 10 K. The ordering temperature of the Eu sublattice is strongly affected by the sample’s thermal history and rapid quenching from the melting point may lead to a complete suppression of that ordering.
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