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We have synthesized the superconducting KxFe2−ySe2 (x = 0.8) crystal by using the one step technique. SEM images demonstrate terrace-like structures on the surface and the sample contains two phases. XRD pattern gives the (00ℓ) peaks. The main peaks are indexed to the I4/m space group and the lattice parameter c is calculated to be 13.94076 Å. ZFC magnetization measurement exhibits a very sharp transition...
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