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