Blocking of iron magnetic moments and Spin density wave in FeTi2S4 and Fe2TiS4

TL;DR

This study investigates the magnetic properties and spin density wave phenomena in iron-titanium sulfides FeTi2S4 and Fe2TiS4 using X-ray diffraction and Mössbauer spectroscopy, revealing magnetic transitions and structural correlations.

Contribution

It provides new insights into the magnetic transitions and spin density wave behavior in FeTi2S4 and Fe2TiS4, linking atomic positions to magnetic phenomena.

Findings

FeTi2S4 transitions from paramagnetic to magnetic order at 145 K with low hyperfine field.

Fe2TiS4 exhibits a transition at 290 K with incommensurate to commensurate SDW transition at 255 K.

Magnetic behavior is correlated with atomic displacements and crystallographic structure.

Abstract

Iron-titanium sulfides FeTi2S4 and Fe2TiS4 have been structurally and magnetically characterized using powder X Ray Diffraction with Rietveld refinement method and 57Fe M\"ossbauer spectroscopy at variable temperature. Both sulfides have the same crystallographic phase, based on the monoclinic Cr3S4 type structure and vary in atomic coordinates; FeTi2S4 retains the ideal atomic positions proposed for the Cr3S4 phase, while in Fe2TiS4 the metal displacements from ideal sites are noticeable. M\"ossbauer spectra reveal different magnetic behaviors; in FeTi2S4 there is a transition from paramagnetic to magnetic ordering at temperature Tc = 145 K, giving rise to unusually low hyperfine magnetic field of 2.5 T (at 77 K) if compared with values of iron magnetic moments reported previously, this behavior is explained on the basis of blocking Fe localized magnetic moments by the Spin density wave (SDW) originated from 3d Ti atoms. In Fe2TiS4 a transition from paramagnetic to (SDW) arises at Tc = 290 K, the SDW is spread in both Fe and Ti metals through [101] crystallographic plane and undergoes a transition of first order from Incommensurate SDW (ISWD) to Commensurate SDW (CSDW) at TIC = 255 K. The atomic positions in the unit cell are correlated to the magnetic behavior in both sulfides.