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Since the discovery of high temperature superconductivity in F-doped LaFeAsO,many new iron based superconductors with different structures have beenfabricated2. The observation of superconductivity at about 32 K in KxFe2-ySe2with the iso-structure of the FeAs-based 122 superconductors was a surprise andimmediately stimulated the interests because the band structure calculation8predicted the absence of the hole pocket which was supposed to be necessary forthe theoretical picture of S+- pairing. Soon later, it was found that thematerial may separate into the insulating antiferromagnetic K2Fe4Se5 phase andthe superconducting phase. It remains unresolved that how these two phasescoexist and what is the parent phase for superconductivity. In this study weuse different quenching processes to produce the target samples with distinctmicrostructures, and apply multiple measuring techniques to reveal a closerelationship between the microstructures and the global appearance ofsuperconductivity. In addition, we clearly illustrate three dimensionalspider-web-like superconducting filamentary paths, and for the first timepropose that the superconducting phase may originate from a state with onevacancy in every eight Fe-sites with the root8*root10 parallelogram structure.Comment: 22 pages, 7 figure

Influence of microstructure on superconductivity in KxFe2−ySe2 and evidence for a new parent phase K2Fe7Se8