Effect of Titanium Diselenide Doping on the Magnetic State and Transport Properties of FeTe

The iron–tellurium-based compounds Fe 1.1 Te(TiSe 2 ) y doped with titanium diselenide ( y = 0, 0.04, 0.08, 0.1, 0.2) have been synthesized for the first time and studied by means of X-ray diffraction, electrical resistivity and magnetization measurements. It has been shown that the addition of a small amount of titanium diselenide to single-phase iron telluride with a tetragonal crystal structure leads to the appearance of superconductivity, a decrease in the Néel temperature and contraction of the crystal lattice at y ≥ 0.04. The maximal temperature of the onset of the superconducting transition ~ 13 K is observed for a sample with the nominal composition Fe 1.1 Te(TiSe 2 ) 0.1 . The behavior of the resistivity with temperature below is observed to depend on the current value, which may indicate superconductivity characteristic of granular superconductors.