Wang Zhi-Cheng, He Chao-Yang, Wu Si-Qi, Tang Zhang-Tu, Liu Yi, Ablimit Abduweli, Tao Qian, Feng Chun-Mu, Xu Zhu-An, Cao Guang-Han
Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China.
J Phys Condens Matter. 2017 Mar 22;29(11):11LT01. doi: 10.1088/1361-648X/aa58d2. Epub 2017 Feb 7.
We report synthesis, crystal structure and physical properties of a novel quinary compound RbGdFeAsO. The new iron oxyarsenide is isostructural to the fluo-arsenide KCaFeAsF, both of which contain separate double FeAs layers that are self hole-doped in the stoichiometric composition. Bulk superconductivity at [Formula: see text] 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 ([Formula: see text]d[Formula: see text]/d[Formula: see text] [Formula: see text] T K) is measured for the polycrystalline sample.
