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- W1968653312 abstract "The crystal and magnetic structures of the lamellar Fe x TiSe 2 (x=0.25 and 0.48) antiferromagnets have been refined from neutron diffraction powder data at several temperatures ranging from 2 to 300 K. For both compounds, Ti is found to be substituted for 8% of Fe so that the separation of the two metals is not complete. The distortion of the Ti-containing octahedra decreases from x=0.25 to x=0.48 i.e. as the lower-occupied d-subband filling increases due to charge transfer upon intercalation. The origin of the previously evidenced magneto-elastic effect for x=0.48 is shown to lie in the existence of ferromagnetic coupling between nearest-neighbouring iron moments along b (d Fe-Fe =3.59 A), the exchange parameter of which increases with decreasing distance. The Ti conduction electron spins are shown to be greatly polarized by the Fe localized moments leading to the onset of a commensurate spin density wave below T N . The refinement of the 2 K intensities yields Ti moment values equal to 0.07(3) and 0.31(3) μ b for x=0.25 and 0.48, respectively Determination a partir de l'affinement des spectres de diffraction de neutrons realises sur poudres entre 2 et 300 K. Mise en evidence d'une permutation partielle entre sous-reseaux Fe et Ti; effets du transfert de charge consecutif a l'insertion. Interpretation de l'effet magnetoelastique precedemment observe pour Fe 0,48 TiSe 2 (interaction ferromagnetique entre premiers voisins de Fe); mise en evidence d'une forte polarisation des spins des electrons de conduction de Ti conduisant a une onde de densite de spin commensurable au-dessus de T N ; moments magnetiques" @default.
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- W1968653312 date "1987-01-01" @default.
- W1968653312 modified "2023-09-26" @default.
- W1968653312 title "Crystal and magnetic structures of Fe0.25TiSe2 and Fe0.48TiSe2" @default.
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- W1968653312 doi "https://doi.org/10.1051/rphysap:0198700220100113100" @default.
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