We report synthesis, crystal structure and physical properties of a novel quinary compound RbGd2Fe4As4O2. The new iron oxyarsenide is isostructural to the fluo-arsenide KCa2Fe4As4F2, both of which contain separate double Fe2As2 layers that are self hole-doped in the stoichiometric composition. Bulk superconductivity at Tc = 35 K is demonstrated by the measurements of electrical resistivity, dc magnetic susceptibility and heat capacity. An exceptionally high value of the initial slope of the upper critical field (μ0dHc2/dT∣Tc = 16.5 T/K) is measured for the polycrystalline sample.
@article{arxiv.1606.08161,
title = {Superconductivity at 35 K by self doping in RbGd$_2$Fe$_4$As$_4$O$_2$},
author = {Zhi-Cheng Wang and Chao-Yang He and Si-Qi Wu and Zhang-Tu Tang and Yi Liu and Abduweli Ablimit and Qian Tao and Chun-Mu Feng and Zhu-An Xu and Guang-Han Cao},
journal= {arXiv preprint arXiv:1606.08161},
year = {2017}
}
Comments
10 pages, 6 figures, 1 table, the crystal structure is amended