Magnetic structure of FeSn2, and reflections on FeGe2cells

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Abstract
The intermetallic compound FeSn2 has been studied by neutron diffraction, magnetisation measurements and Mossbauer spectroscopy. This compound is antiferromagnetic (TN=378K) and a second transition occurs at Tt=93K. The unit cell of the antiferromagnetic array is the same size as the chemical cell. Between TN and Tt the magnetic structure is collinear, characterised by ferromagnetic planes (100), coupled antiferromagnetically along the (100) direction; the spin direction lies in the (001) plane near the a axis. AT tt=93K a spin rotation to the (110) direction is observed. Below Tt, FeSn2 becomes non-collinear antiferromagnetic and the iron moments form a canted structure along the c axis. The angle between the two spin dynamics is 18 degrees and the moment per iron atom observed is 16.4+or-0.05 mu B at 5K. This magnetic behavior of FeSn2 is similar to that observed for FeGe2. A new description of the non-collinear structure of FeGe2 is proposed and the moment per iron atom is corrected to mu =1.21 mu B.

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