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Crystal Structure and Magnetic Properties of Pyrrhotite-Type Compounds Fe_{7-y}V_{y}S₈

100%
Selezneva N., Ibrahim P., Toporova N., Sherokalova E., Baranov N.
Acta Physica Polonica A
|
2018
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vol. 133
|
issue 3
450-452
EN
The pyrrhotite-type compounds Fe_{7-y}V_{y}S₈ have been synthesized and studied by means of the X-ray diffraction and magnetization measurements in order to reveal how the substitution of V for Fe affects the crystal structure, phase transition and magnetic properties. The growth of the V content in Fe_{7-y}V_{y}S₈ results in changes of the crystal structure and leads to a sharp decrease in the resultant magnetization, non-monotonous change of the coercive field and reduction of the magnetic ordering temperature. Unlike ferrimagnetic ordering in pyrrhotite Fe₇S₈ the compound V₇S₈ is observed to exhibit a Pauli-paramagnetic behaviour.
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Substitution Effects on the Magnetic Properties of Fe-Containing Chalcogenides with NiAs-Type Structures

86%
Baranov N., Selezneva N., Sherokalova E., Gubkin A., Sherstobitov A., Shishkin D.
Acta Physica Polonica A
|
2018
|
vol. 133
|
issue 3
447-449
EN
The changes in the magnetization processes caused by Se for S substitutions in the layered chalcogenide compounds Fe_{x}TiS_{2-y}Se_{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_{0.5}TiS_{2-y}Se_{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_{0.66}TiS_{2-y}Se_{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_{x}TiS_{2-y}Se_{y} are suggested to be strongly affected by the distribution of Fe ions and vacancies in cationic layers.
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