Crystal Structure and Superconductivity at about 30 K in $A$Ca$_2$Fe$_4$As$_4$F$_2$ ($A$ = Rb, Cs)

Zhi-Cheng Wang; Chao-Yang He; Zhang-Tu Tang; Si-Qi Wu; Guang-Han Cao

doi:10.1007/s40843-016-5150-x

Crystal Structure and Superconductivity at about 30 K in $A$Ca$_2$Fe$_4$As$_4$F$_2$ ($A$ = Rb, Cs)

Superconductivity 2017-04-05 v1

Authors: Zhi-Cheng Wang , Chao-Yang He , Zhang-Tu Tang , Si-Qi Wu , Guang-Han Cao

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Abstract

We have synthesized two iron fluo-arsenides $A$ Ca $_2$ Fe $_4$ As $_4$ F $_2$ with $A$ = Rb and Cs, analogous to the newly discovered superconductor KCa $_2$ Fe $_4$ As $_4$ F $_2$ . The quinary inorganic compounds crystallize in a body-centered tetragonal lattice with space group I4/mmm, which contain double Fe $_2$ As $_2$ layers that are separated by insulating Ca $_2$ F $_2$ layers. Our electrical and magnetic measurements on the polycrystalline samples demonstrate that the new materials undergo superconducting transitions at Tc = 30.5 K and 28.2 K, respectively, without extrinsic doping. The correlations between Tc and structural parameters are discussed.

Keywords

superconductivity crystal structure iron-based superconductors layered compounds transition temperature

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@article{arxiv.1704.01051,
  title  = {Crystal Structure and Superconductivity at about 30 K in $A$Ca$_2$Fe$_4$As$_4$F$_2$ ($A$ = Rb, Cs)},
  author = {Zhi-Cheng Wang and Chao-Yang He and Zhang-Tu Tang and Si-Qi Wu and Guang-Han Cao},
  journal= {arXiv preprint arXiv:1704.01051},
  year   = {2017}
}

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9 pages,4 figures, 1 table

Crystal Structure and Superconductivity at about 30 K in $A$Ca$_2$Fe$_4$As$_4$F$_2$ ($A$ = Rb, Cs)

Abstract

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