Crystal field effect on the magnetic moment's direction of rare earth ions with low point symmetry in r4co3 (r = Tb, Ho, Dy, Er, Tm) compounds |
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Authors: | J.K. Yakinthos |
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Affiliation: | Nuclear Research Center “Demokritos”, AthensGreece |
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Abstract: | Neutron diffraction measurements, made on powder samples, show that Ho4Co3 and Er4Co3 intermetallic compounds are ferrimagnetic at 4.2 K. The magnetic moments of the 2 holmium sites are 8.7 and 2.1 μB and those of the erbium sites are equal to 8.7 and 8.1μB. The cobal+ magnetic moment is 0.2μB for both compounds. The easy magnetization direction lies on the hexagonal plane for Ho4Co3 while for Er4Co3 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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