Block antiferromagnetism and checkerboard charge ordering in the alkali-doped iron selenides R1-xFe2-ySe2

Li Wei; Dong Shuai; Fang ChenHu Jiangping

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Block antiferromagnetism and checkerboard charge ordering in the alkali-doped iron selenides R1-xFe2-ySe2

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By performing first-principles electronic structure calculations and analyzing effective magnetic model of alkali-doped iron selenides, we show that the materials without iron vacancies should approach a checkerboard phase in which each of the four Fe sites group together in a tetragonal structure. The checkerboard phase is the ground state with a block antiferromagnetic (AFM) order and a small charge density wave order in the absence of superconductivity. Both of them can also coexist with superconductivity. The results can explain the 2 x 2 ordered patterns and hidden orders observed in various different experiments, clarify the missing link between AFM and superconducting phases, suggest that the block-AFM state is the parent state, and can unify the understanding of various observed phases in alkali-doped iron selenides.

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《Physical review, B. Condensed matter and materials physics》 |2012年第10期|共5页
作者
Li Wei; Dong Shuai; Fang ChenHu Jiangping;
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作者单位

Southeast Univ, Dept Phys, Nanjing 211189, Peoples R China;

Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA;

Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China;

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正文语种英语
中图分类物理学;固体理论;
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Block antiferromagnetism and checkerboard charge ordering in the alkali-doped iron selenides R1-xFe2-ySe2

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