On the Specific Heat of Fe(HCOO)2・2H2O

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  • On the Specific Heat of Fe(HCOO)<SUB>2</SUB>·2H<SUB>2</SUB>O

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A theoretical analysis of the magnetic specific heat of Fe(HCOO)2·2H2O is performed on the basis of a two site model, RA=1⁄2 and SB=2, where RA is the fictitious spin for the lowest doublet. The contribution to the specific heat from A and B sites can be calculated separately and the effect of weak AB interaction is considered by the high-temperature series expansion technique. The experimental result turns out to be well explained by introducing a large Sz4-term for B site ions. As a microscopic origin of Sz4-term, the magnetostrictive energy at B site is shown to be favorable.

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