Physical Properties of [A6Cl][Fe24Se26] (A =K, Rb) with Self-Similar Structure

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2020,（1）
• 页码范围: 74-77
• 页数: 4页
• 语种: 英文
• DOI: 10.1088/0256-307X/37/1/017401

摘要

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].