Abstract
Neutron diffraction, specific heat and magnetization measurements were appliedto study the magnetic structures in Mn0.88Fe0.12WO4 using singlecrystal and powder samples. A commensurate antiferromagnetic structure with apropagation vector k = (1/4,1/2,1/2) below 13.5 K and anincommensurate structure with k = (0.23,0.5,0.508) between 13.5 Kand 15.5 K were found to be the dominating ordered states. The temperaturebehaviour of the propagation vector above the IC-C phase transition shows alogarithmic behaviour. An FeWO4-type ordering of spins with k≈(1/2,0,0) is observed below 19 K and coexists between 15.5 K and13.5 K with the MnWO4-type structure. Our experimental results indicate acluster-like FeWO4-type magnetic ordering on a diluted 3D lattice, whichinterpenetrates the dominating MnWO4-type spin ordering. Below 13 K, with themajority of spins ordered in the commensurate MnWO4-type structure,reflections which can be indexed to a unit cell doubled along thecrystallographic a-axis appear again; however, these intensities cannotpurely be related to Bragg diffraction by ordered local magnetic moments atthe (Mn, Fe) positions.
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