Abstract
In the past few years, iron chalcogenide compounds have attracted considerable attentions due to its unique superconductivity and simplest structure. Till now, many studies have been devoted to explore the superconductivity in iron chalcogenides, including FeSe, FeTe, FeS and their derivatives produced by intermediate doping. However, compared with FeSe, although the superconductivity in S doped FeTe has been widely studied, very few attempts have been reported on the transport properties for this material. Herein the evolution of the superconductivity and the Hall effect up to high S addition levels in FeTe1-xSx (0 ≤ x ≤ 0.5) were studied. It suggests that S substitution for Te sites can effectively suppress the antiferromagnetic ordering and introduce bulk superconductivity in FeTe. The highest Tc ∼9.0 K is achieved in FeTe0.8S0.2 with nominal S content. Hall effect suggests that S addition in FeTe undergoes a reconstruction of hole-type Fermi surface, indicating doping or enhancement of scattering of hole carriers. This work systemically studied the superconductivity of FeTe with S addition and proposes complementary understanding for the intrinsic transport mechanism of iron-based superconductivity.
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