Abstract
The effect of titanium or niobium disulfides doping of iron telluride has been studied for the first time by means of x-ray diffraction analysis, electrical resistivity and magnetization measurements. It has been revealed that an increase in the dopant content in the Fe1.1Te(TS2)y (T = Ti, Nb) systems (y = 0, 0.04, 0.08, 0.1, 0.2) is accompanied by the additional phase separation and leads to a decrease in the crystal lattice parameters of the tetragonal phase, partial suppression of antiferromagnetic ordering and an appearance of superconductivity. In doped samples a transition to the superconducting state has been detected upon cooling below Tconset ∼9 K coexisting with antiferromagnetism. Superconductivity is suggested to exhibit a granular character due to inhomogeneity of the samples and the small volume fraction of superconducting phase. The difference in the superconducting transitions for both dopant types may be associated with different morphologies and compositions of resulting phases.
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