Superconductivity in KCa$_2$Fe$_4$As$_4$F$_2$ with Separate Double Fe$_2$As$_2$ 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 KCa$_2$Fe$_4$As$_4$F$_2$ with Separate Double Fe$_2$As$_2$ Layers

Superconductivity 2016-07-07 v1 Strongly Correlated Electrons

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

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Abstract

We report synthesis, crystal structure and physical properties of a quinary iron-arsenide fluoride KCa $_2$ Fe $_4$ As $_4$ F $_2$ . The new compound crystallizes in a body-centered tetragonal lattice (with space group $I4/mmm$ , $a$ = 3.8684(2) {\AA}, c = 31.007(1) {\AA}, and $Z$ = 2), which contains double Fe $_2$ As $_2$ conducting layers separated by insulating Ca $_2$ F $_2$ layers. Our measurements of electrical resistivity, dc magnetic susceptibility and heat capacity demonstrate bulk superconductivity at 33 K in KCa $_2$ Fe $_4$ As $_4$ F $_2$ .

Keywords

iron-arsenide fluoride KCa2Fe4As4F2 superconductivity crystal structure double Fe2As2 layer bulk superconductivity quinary compound

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@article{arxiv.1607.01611,
  title  = {Superconductivity in KCa$_2$Fe$_4$As$_4$F$_2$ with Separate Double Fe$_2$As$_2$ Layers},
  author = {Zhi-Cheng Wang and Chao-Yang He and Si-Qi Wu and Zhang-Tu Tang and Yi Liu and Abduweli Ablimit and Chun-Mu Feng and Guang-Han Cao},
  journal= {arXiv preprint arXiv:1607.01611},
  year   = {2016}
}

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11 pages, 7 figures, 2 tables

Superconductivity in KCa$_2$Fe$_4$As$_4$F$_2$ with Separate Double Fe$_2$As$_2$ Layers

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