Mossbauer spectroscopic study of low-temperature spin structure and magnetic interactions in {N(n-C5H11) 4[ (MnFeIII)-Fe-II(C2O4)(3)]}(infinity)

摘要

Fe-57 Mossbauer spectroscopy of the layered ferrimagnetic material {N(n-C5H11)(4)[(MnFeIII)-Fe-II(C2O4)(3)]}(infinity) has been performed at 100 and 4.2 K under different external magnetic field conditions. This study has successfully detected two different types of Fe-III high-spin sites in the lattices. The hyperfine field values for all the Fe-III high-spin sites are estimated. The magnetic field dependence of the spin canting angle of both the Fe-III spin sites has been realized. It is understood that the layered structure of the compound may have two kinds of sub-lattices as (Mn-II-ox-Fe-A(III) -...) and ( Mn-II-ox-Fe-III (B) -...), where Fe-A(III) and Fe-B(III) are aligned to give rise to a ferromagnetic interlayer interaction. The present observations clearly support the earlier results made on this material through magnetic and low-temperature calorimetric studies.