Physical Properties of [$A_{6}$Cl][Fe$_{24}$Se$_{26}$]($A$=K, Rb) with Self-Similar Structure
Shaohua Wang, Qiangwei Yin, Hechang Lei**
Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials $&$ Micro-nano Devices, Renmin University of China, Beijing 100872
Abstract：We have successfully synthesized two novel compounds [$A_{6}$Cl][Fe$_{24}$Se$_{26}$] ($A$ = K, Rb). The key structural units of them are FeSe octamers, consisting of edge-shared FeSe$_{4}$ tetrahedra. Two kinds of FeSe octamer layers with different connection configurations stack along the $c$ axis, forming a three-dimensional (3D) TiAl$_{3}$-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 $T_{\rm N}\sim 110$ K and 75 K for [K$_{6}$Cl][Fe$_{24}$Se$_{26}$] and [Rb$_{6}$Cl][Fe$_{24}$Se$_{26}$].
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2020, Vol. 37 
