Superconductivity in KCa2Fe4As4F2 with Separate Double Fe2As2 Layers
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 I 4/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.
fluoride, KCa2Fe4As4F2. The new compound crystallizes in a body-centered tetragonal
lattice (space group I 4/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.
[引用][C] Superconductivity in KCa2Fe4As4F2 with Separate Double Fe2As2 Layers
W Zhi-Cheng, H Chao-Yang, W Si-Qi, T Zhang-Tu, L Yi… - 2016
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