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We report self flux growth and characterization of FeTe1-xSx (x= 0.00 to0.25) single crystal series. Surface X-ray diffraction (XRD) exhibitedcrystalline nature with growth in (00l) plane. Micro-structural (electronmicroscopy) images of representative crystals showed the slab-like morphologyand near stoichiometric composition. Powder XRD analysis (Rietveld) of singlecrystals exhibited tetragonal structure with P4/nmm space group and decreasinga and c lattice parameters with increase in x. Electrical resistivitymeasurements (R-T) showed superconductivity with Tconset at 9.5K and 8.5K for x=0.10 and x =0.25 respectively. The un-doped crystal exhibited known step likeanomaly at around 70K. Upper critical field Hc2(0), as calculated from magnetotransport for x =0.25 crystal is around 60Tesla and 45Tesla in H//ab and H//cdirections. Thermal activation energy [U0(H)] calculated for x =0.10 and 0.25crystals followed weak power law, indicating single vortex pinning at lowfields. Mossbauer spectra for FeTe1-xSx crystals at 300K and 5K are comparedwith non superconducting FeTe. Both quadrupole splitting (QS) and isomer shift(IS) for S doped crystals were found to decrease. Also at 5K the hyperfinefield for x =0.10 superconducting crystal is decreased substantially from10.6Tesla (FeTe) to 7.2Tesla. For x =0.25 crystal, though small quantity ofun-reacted Fe is visible at room temperature, but unlike x =0.10, the lowtemperature (5K) ordered FeTe hyperfine field is nearly zero.

Superconductivity in doped FeTe1-xSx (x= 0.00 to 0.25) single crystals