【摘 要】
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We have successfully synthesized two novel compounds [A6Cl][Fe24Se26] (A =K,Rb).The key structural units of them are FeSe octamers,consisting of edge-shared FeS
【机 构】
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Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nan
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We have successfully synthesized two novel compounds [A6Cl][Fe24Se26] (A =K,Rb).The key structural units of them are FeSe octamers,consisting of edge-shared FeSe4 tetrahedra.Two kinds of FeSe octamer layers with different connection configurations stack along the c axis,forming a three-dimensional (3D) TiAla-type structure.Interestingly,the 3D structural topology of these ocatmers in one unit cell is similar to the local atomic arrangement of themselves,i.e.,self-similarity in structure.Physical property characterizations indicate that both the compounds exhibit insulating antiferromagnetism with Neel temperatures TN ～ 110 K and 75K for [K6Cl][Fe24Se26] and [Rb6Cl][Fe24Se26].
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