Abstract
An investigation of the magnetic and the nuclear structures of Cr5 S6 at four different temperatures has been carried out by means of neutron diffraction. It has been found that in the nuclear structure, deviations from the idealized structure as given by Jellinek are small at all temperatures. The magnetic structure of the antiferromagnetic phase is an antiferromagnetic screw-type spiral with its propagation vector along the c axis. The spin structure in the ferrimagnetic state is collinear and strongly related to the antiferromagnetic structure. Experimental results show that the transition from the antiferromagnetic to the ferrimagnetic state is coupled to the occurrence of a noncollinear component of the moment on the 4f sites.

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