Abstract
We have carried out neutron diffraction and antiferromagnetic resonance investigations of Gd 2CuO 4 single crystals. The former shows that the magnetic moments of the gadolinium ions order antiferromagnetically at T N=6.4 K with the propagation vector k =(0, 0, 0). The two Gd atoms of the primitive unit cell related by the centre of symmetry have oppositely directed moments. The antiferromagnetic resonance spectra indicate that Gd 2CuO 4 belongs to the class of “easy plane” antiferromagnets and show the presence of a spin reorientation phase transition at H c=0.88 T ( H ‖[100], T=1.8 K). From these data we conclude that Gd 2CuO 4 has a collinear antiferromagnetic structure.
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