Temperature features of the magnetic interactions in manganese stannide

Abstract

The features of the magnetic interactions in manganese stannide Mn1.66Fe0.02Sn with a structure of the B82 type are investigated on the basis of Mössbauer-effect measurements on the iron and tin atoms. The Curie temperature of this compound according to the Fe57 data is TC=265K, while for Sn119 it is TC=250K; both of these are higher than the value of TC determined by the Faraday method (240K). The participation of the tin atoms in the magnetic exchange interaction in MnII–Sn–MnII chains is confirmed. It is shown that effectively only three of the five manganese atoms occupying the trigonal–bipyramidal MnII positions nearest to a tin atom have any influence on the magnetic interactions at the tin nucleus. The magnetic fields at the nuclei of the manganese atoms in the trigonal–bipyramidal positions in MnII–Sn–MnII chains are significantly (2–2.5 times) larger than the field at the nuclei of the manganese atoms in the octahedral positions in MnI–MnI.