Studies of the Magnetic Structure of FeSn Using the Mössbauer Effect

Abstract

From the analysis of 57 Fe and 119 Sn Mössbauer spectra a modified anti-ferromagnetic spin structure is proposed. The ferromagnetic ordering of the iron moments in the basal planes is partly destroyed and the magnetic unit cell is four times as large as the chemical unit cell, being doubled both along the a and the c axis. The temperature variation of the reduced magnetic hyperfine field for Sn(1) strongly deviates from the corresponding quantity found for iron. The Neel temperature is found to be 368 K and the critical exponent β obtained is 0.340.