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Structural and Transport Studies of Under Doped FeTe1-xSex(x=0.0, 0.01, 0.03, 0.05) Single Crystals

We report synthesis of under doped non-superconducting parent compound of iron chalcogenide, i.e FeTe1-xSex (x=0.0, 0.01, 0.03, 0.05) single crystals by flux free method. These FeTe1-xSex (x=0.0, 0.01, 0.03, 0.05) single crystals are crystallized in the tetragonal structure with space group P4/nmm at room temperature. Detailed scanning electron microscopy (SEM) results showed that the crystals are formed in slab-like morphology structure. Powder X-Ray diffraction (XRD) results show that (0 0 l) peaks are shifted towards higher angel with increasing Se concentration. Coupled magnetic and structural phase transition temperature, being seen as a step in resistivity, decreases from around 67K for x = 0.0 to 55K for x = 0.05 crystal. Further, the step in resistivity is seen to be hysteric (ΔT) in nature, i.e., different step temperatures in cooling and warming cycles. Interestingly, the hysteric (ΔT) becomes narrower from around 5.8K for x =0.0 to 0.95K for x =0.05 crystal.