Crystal Structure and Superconductivity at about 30 K in ACa₂Fe₄As₄F₂ (A = Rb, Cs)

2017/04/04 by Zhi-Cheng Wang, Chao-Yang He, Zhang-Tu Tang +2 · 1 citation
Physics and Astronomy · #cond-mat.supr-con

paper · pdf · doi:10.1007/s40843-016-5150-x

published as Science China Materials 60, 83-89 (2017) · 9 pages,4 figures, 1 table

arxiv created 2017/04/04 · arxiv updated 2017/04/05

Abstract

We have synthesized two iron fluo-arsenides ACa₂Fe₄As₄F₂ with A = Rb and Cs, analogous to the newly discovered superconductor KCa₂Fe₄As₄F₂. The quinary inorganic compounds crystallize in a body-centered tetragonal lattice with space group I4/mmm, which contain double Fe₂As₂ layers that are separated by insulating Ca₂F₂ 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.

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