Superconductivity at 35 K by self doping in RbGd2Fe4As4O2. (7th February 2017)

• Record Type: Journal Article
• Authors: 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
• Is Part Of: Journal of physics. Volume 29:Number 11(2017)
• Publication Date: 2017-02-07
• Subjects: Fe-based superconductor -- crystal structure -- self doping -- superconductivity; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/aa58d2
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: We report synthesis, crystal structure and physical properties of a novel quinary compound RbGd2 Fe4 As4 O2 . The new iron oxyarsenide is isostructural to the fluo-arsenide KCa2 Fe4 As4 F2, both of which contain separate double Fe2 As2 layers that are self hole-doped in the stoichiometric composition. Bulk superconductivity at T c = 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 ( μ 0 d H c 2 /d T | T c = 16.5 T K −1 ) is measured for the polycrystalline sample.