Superconductivity in KCa₂Fe₄As₄F₂ with Separate Double Fe₂As₂ Layers

2016/07/06 by Zhi-Cheng Wang, Chao-Yang He, Si-Qi Wu +5 · 1 citation
Physics and Astronomy · #cond-mat.supr-con #cond-mat.str-el

paper · pdf · doi:10.1021/jacs.6b04538

published as J. Am. Chem. Soc. 138(25), 7856 (2016) · 11 pages, 7 figures, 2 tables

arxiv created 2016/07/06 · arxiv updated 2016/07/07

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) Å, c = 31.007(1) Å, 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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