Sulfur annealing effect for superconductivity in iron chalcogenide compounds

Abstract

We discovered a novel annealing method for Fe-chalcogenide superconductors. It was found that sulfur annealing deintercalated excess Fe via formation of FeS2. Due to its specifics, sulfur annealing is applicable when preparing Fe-chalcogenide-based wires or cables.

13 pages, 8 figures