Mössbauer spectral study of RFe11.3W0.7 compounds (R=Dy, Ho, Er, and Lu)

Abstract

The series of compounds RFe11.3W0.7, where R=Dy, Ho, Er, and Lu, has been measured by Mössbauer spectroscopy between 15 and 295 K. A model which takes into account the Wigner–Seitz cell local environment of each iron site, the distribution of tungsten atoms on the 8i site, and the temperature-dependent magnetic structures of the compounds has been used to analyse the spectra. The assignment and the temperature dependencies of the hyperfine fields and the isomer shifts are in complete agreement with the Wigner–Seitz cell analysis of the three iron sites in RFe11.3W0.7 compounds. The plausible orientations of the iron magnetic moments in the canted magnetic phase of ErFe11.3W0.7 compound have been established by a thorough Mössbauer spectral analysis. The Mössbauer spectra of DyFe11.3W0.7 clearly show the influence of the two spin re-orientations occurring in this compound and indicate the directions of the iron magnetic moments in both canted and planar magnetic arrangements.