Superconductivity and magnetism in Ir-doped GdFeAsO |
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| Authors: | YJ Cui YL Chen CH Cheng Y Yang J Jiang YZ Wang Y Zhang Y Zhao |
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| Institution: | 1. Key Laboratory of Magnetic Levitation and Maglev Trains (Ministry of Education of China), Superconductivity R&D Center (SRDC), Mail Stop 165#, Southwest Jiaotong University, Chengdu, Sichuan 610031, China;2. School of Materials Science and Engineering, University of New South Wales, Sydney 2052 NSW, Australia |
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| Abstract: | The 5d-transition metal, Ir has successfully been doped at Fe site and induced superconductivity in GdFeAsO at Tc = 18.9 K and ∼20 atom%. The Ir-doping shortened the c-axis length and stretched the a-axis one, which led to enhance the coupling between the FeAs- and SmO-layer, and to weaken the bonding between Fe and As atom. Paramagnetism was observed in all of the samples, which was resulted from the magnetic Gd ion as in the F-doped GdFeAsO. An upper critical field of GdFe0.8Ir0.2AsO was extrapolated to around 24 T, much smaller than that of F-doped GdFeAsO owing to a relatively low Tc and small value of dHc2/dT. |
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| Keywords: | Superconductivity Fe-based compounds GdFeAsO Ir doping |
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