Author： Wei Bao Guan-Nan Li Qing-Zhen Huang Gen-Fu Chen Jun-Bao He Du-Ming Wang Green M. A. Yi-Ming Qiu Jian-Lin Luo Mei-Mei Wu
Publisher： IOP Publishing
ISSN： 0256-307X
Source： Chinese Physics Letters, Vol.30, Iss.2, 2013-02, pp. : 27402-27405
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Abstract
Combining in-depth neutron diffraction and systematic bulk studies, we discover that the √5 × √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 √5 × √5 order is highly developed. Superconductivity occurs in such a metallic phase.
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