Abstract
Neutron diffraction measurements, made on powder samples, show that Ho 4Co 3 and Er 4Co 3 intermetallic compounds are ferrimagnetic at 4.2 K. The magnetic moments of the 2 holmium sites are 8.7 and 2.1 μ B and those of the erbium sites are equal to 8.7 and 8.1μ B . The cobal + magnetic moment is 0.2μ B for both compounds. The easy magnetization direction lies on the hexagonal plane for Ho 4Co 3 while for Er 4Co 3 there are 2 anisotropy directions. Exchange interactions between rare-earth ions of both sites are very weak compared with the total crystal field splitting of the ground state multiplet J. The crystal field parameters are calculated and the magnitude and direction of the rare-earth magnetic moments in each site is determined.
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