Journal
EPL
Volume 111, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1209/0295-5075/111/27004
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Funding
- Ministry of Science and Technology [NSC102-2112-M-001-025-MY3]
- Academia Sinica Thematic Research, Taiwan
- AFOSR under DoDMURI [FA9550-09-1-0583]
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In the high-T-c potassium-intercalated FeSe, there has been significant debate regarding what the exact parent compound is. Here we show that the Fe-vacancy ordered K2Fe4Se5 is the magnetic, Mott insulating parent compound of the superconducting state. Non-superconducting K2Fe4Se5 becomes a superconductor after high-temperature annealing, and the overall picture indicates that superconductivity in K2-xFe4+ySe5 originates from the Fe-vacancy order-to-disorder transition. Thus, the long-pending question as to whether magnetic and superconducting state are competing or cooperating for cuprate superconductors may also apply to the Fe-chalcogenide superconductors. It is believed that the iron selenides and related compounds will provide essential information to understand the origin of superconductivity in the iron-based superconductors, and possibly to the superconducting cuprates. Copyright (C) EPLA, 2015
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