Superconductivity in KCa2Fe4As4F2 with Separate Double Fe2As2 Layers

Zhi-Cheng Wang; Chao-Yang He; Si-Qi Wu; Zhang-Tu Tang; Yi Liu; Abduweli Ablimit; Chun-Mu Feng; Guang-Han Cao

doi:10.1021/jacs.6b04538

Superconductivity in KCa2Fe4As4F2 with Separate Double Fe2As2 Layers

J Am Chem Soc. 2016 Jun 29;138(25):7856-9. doi: 10.1021/jacs.6b04538. Epub 2016 Jun 21.

Authors

Zhi-Cheng Wang¹, Chao-Yang He¹, Si-Qi Wu¹, Zhang-Tu Tang¹, Yi Liu¹, Abduweli Ablimit¹, Chun-Mu Feng¹, Guang-Han Cao^{1

2}

Affiliations

¹ Department of Physics and State Key Lab of Silicon Materials, Zhejiang University , Hangzhou 310027, China.
² Collaborative Innovation Centre of Advanced Microstructures , Nanjing 210093, China.

PMID: 27321364
DOI: 10.1021/jacs.6b04538

Abstract

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.

Publication types

Research Support, Non-U.S. Gov't