ACTA

Substitution Effects on the Magnetic Properties of Fe-Containing Chalcogenides with NiAs-Type Structures

N.V. Baranov^a,b, N.V. Selezneva^b, E.M. Sherokalova^b, A.F.Gubkin^a,b, A.A. Sherstobitov^a,b and D.A. Shishkin^a,b
^aM.N. Miheev Institute of Metal Physics, Ural Branch of RAS, 620990, Ekaterinburg, Russia
^bInstitute of Natural Sciences and Mathematics, Ural Federal University, 620083, Ekaterinburg, Russia

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The changes in the magnetization processes caused by Se for S substitutions in the layered chalcogenide compounds Fe_xTiS_2-ySe_y (x=0.5, 0.66) with antiferromagnetic (AF) and ferrimagnetic (FI) orderings, respectively, have been studied by using the magnetization and magnetoresistance measurements. Unusually high values of the coercive fields (H_c up to 56 kOe) have been observed at low temperatures in Fe_0.5TiS_2-ySe_y with the Se content y<0.5, which is ascribed to the presence of an unquenched orbital moment on Fe ions and to the formation of a magnetically heterogeneous state in the vicinity of H_c. The Se for S substitution in Fe_0.66TiS_2-ySe_y leads to the transition from the FI to AF state and to non-monotonous change of H_c with a maximal value 22 kOe an y=0.5. The changes in the magnetic state of Fe_xTiS_2-ySe_y are suggested to be strongly affected by the distribution of Fe ions and vacancies in cationic layers.

DOI: 10.12693/APhysPolA.133.447
PACS numbers: 75.30.Kz, 75.50.Vv, 75.60.-d