Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8000775 | Journal of Alloys and Compounds | 2014 | 24 Pages |
Abstract
Powder neutron diffraction and specific heat measurements have been employed to study the evolution of an antiferromagnetic (AFM) structure in the intercalated Fe0.5TiS2âySey compounds with S-Se substitution and under application of a magnetic field. In Fe0.5TiS2 (y=0), the magnetic structure just below TNâ140 K is incommensurate while it becomes commensurate with further cooling below Ttâ125 K. The presence of two magnetic phase transitions at Tt and TN in Fe0.5TiS2 is confirmed by specific heat measurements. The field-induced AFM-FM transitions occurring in Fe0.5TiS2 within temperature interval Tt0.5 are observed to exhibit an AFM structure with the doubled magnetic unit cell along a and c crystallographic directions of the monoclinic crystal lattice (I12/m1 space group). In the transition region around the critical Se concentration ycâ0.5, the magnetic structure of Fe0.5TiS2âySey is found to be incommensurate. The appearance of the AFM order with decreasing temperature in Fe0.5TiS2âySey is accompanied by anisotropic deformations of the crystal lattice. At low temperatures, the Fe magnetic moments in all Fe0.5TiS2âySey form an angle 14-16° to the c crystallographic direction, which can be ascribed to the crystal field effects and spin-orbit couplings.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
A.F. Gubkin, E.M. Sherokalova, L. Keller, N.V. Selezneva, A.V. Proshkin, E.P. Proskurina, N.V. Baranov,