Abstract
The effects of As doping on the superconductivity and magnetism in the Tl0.4K0.4Fe2−y Se2 superconductor are studied. We find that the As doping does not significantly change the occupancy at the Fe-site, meaning a certain amount of Fe ions changes its valence from 2+ to 3+. The superconductivity is gradually suppressed with increasing As doping. The magnetic measurements suggest that though the As doping does not destroy the antiferromagnetic order in the system, it induces an increase in the staggered magnetic moment. These results suggest that the Tl0.4K0.4Fe2−y Se2 system is a system with intrinsic phase separation. The change in the valence state of Fe could be a possible reason for the suppression of superconductivity.
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