Superconductivity in KCa2Fe4As4F2 with Separate Double Fe2As2 Layers

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• 作者：Zhi-Cheng Wang ; Chao-Yang He ; Si-Qi Wu ; Zhang-Tu Tang ; Yi Liu ; Abduweli Ablimit ; Chun-Mu Feng ; Guang-Han Cao
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：June 29, 2016
• 年：2016
• 卷：138
• 期：25
• 页码：7856-7859
• 全文大小：337K
• 年卷期：0
• ISSN：1520-5126

文摘

We report the synthesis, crystal structure, and physical properties of a quinary iron arsenide fluoride, KCa₂Fe₄As₄F₂. The new compound crystallizes in a body-centered tetragonal lattice (space group I4/mmm, a = 3.8684(2) Å, c = 31.007(1) Å, Z = 2) that contains double Fe₂As₂ conducting layers separated by insulating Ca₂F₂ layers. Our measurements of electrical resistivity, direct-current magnetic susceptibility, and heat capacity demonstrate bulk superconductivity at 33 K in KCa₂Fe₄As₄F₂.