Abstract
We report here synthesis and basic characterizations of Bi4O4S3 superconductor. The sample is crystallized in tetragonal I4/mmm space group with lattice parameters a = 3.969(2) A, c = 41.352(1) A. Both DC magnetization and resistivity measurements confirmed that Bi4O4S3 is a bulk superconductor with superconducting transition temperature (Tc) of 4.4K. Closed loops in isothermal magnetization (MH) measurements are clear signature of flux pinning and irreversible behavior. The lower critical field (Hc1) is found to be ∼15 Oe at 2K. The magneto-transport ρ(T, H) measurements showed resistive broadening and decrease in Tc (ρ = 0) with increasing magnetic field. Upper critical field calculated through extrapolation Hc2(0) is ∼ 31kOe with corresponding Ginzburg-Landau coherence length ∼100 A. Our magnetization and electrical transport measurements substantiate the appearance of bulk superconductivity in as synthesized Bi4O4S3.
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