Superconductivity in KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub> with Separate Double Fe<sub>2</sub>As<sub>2</sub> Layers
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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.
创建时间：
2016-06-23
