Journal
CHINESE PHYSICS LETTERS
Volume 30, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0256-307X/30/2/027402
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Funding
- National Basic Research Program of China [2012CB921700, 2011CBA00112, 2011CBA00103, 2009CB929104]
- National Natural Science Foundation of China [11034012, 11190024, 10974175, 10934005]
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Combining in-depth neutron diffraction and systematic bulk studies, we discover that the root 5 x root 5 Fe vacancy order, with its associated block antiferromagnetic order, is the ground state with varying occupancy ratios of the iron 16i and vacancy 4d sites across the phase-diagram of KxFe2-ySe2. The orthorhombic order, with one of the four Fe sites vacant, appears only at intermediate temperatures as a competing phase. The material experiences an insulator to metal crossover when the root 5 x root 5 order is highly developed. Superconductivity occurs in such a metallic phase.
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