Temperature dependent hyperfine interactions in the intermetallic compounds YFe3, TbFe3and ErFe3

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Abstract
The temperature dependent hyperfine interactions of 57Fe nuclei in the intermetallic compounds RFe3, where R=Y, Tb and Er have been studied using the Mossbauer effect. It is found that YFe3 and TbFe3 remain magnetized along a b axis at all temperatures whereas ErFe3 is magnetized along a c axis despite a marked change in the character of the Mossbauer spectrum between 4.2K and 77K. It is also argued that there is no substantial difference in the electronic configurations of the iron atoms at their two main inequivalent crystallographic sites, as witnessed by the temperature dependence of the total shift and the hyperfine fields. The quadrupole parameters were found to be temperature independent and to originate primarily from the lattice. The analogy between similar properties of the RFe2 and the RFe3 is also presented.

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