Abstract

Magnetic neutron diffraction measurements and a complete symmetry analysis of the FeGe2 magnetic structure is made. At low temperatures a commensurate antiferromagnetic structure with K=(2π/a)(1, 0, 0) exists. At 263 K it tansforms into an incommensurate one through a first-order phase transition. The incommensurate-paramagnetic transition is close to second order due to small anisotropy in the basal plane.

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