Abstract
We report Eu-local-spin magnetism and Ni-doping-induced superconductivity (SC) in a 112-type ferroarsenide system Eu(Fe1−xNix)As2. The non-doped EuFeAs2 exhibits two primary magnetic transitions at ~100 and ~40 K, probably associated with a spin-density-wave (SDW) transition and an antiferromagnetic ordering in the Fe and Eu sublattices, respectively. Two additional successive transitions possibly related to Eu-spin modulations appear at 15.5 and 6.5 K. For the Ni-doped sample with x = 0.04, the SDW transition disappears, and SC emerges at Tc = 17.5 K. The Eu-spin ordering remains at around 40 K, followed by the possible reentrant magnetic modulations with enhanced spin canting. Consequently, SC coexists with a weak spontaneous magnetization below 6.2 K in Eu(Fe0.96Ni0.04)As2, which provides a complementary playground for the study of the interplay between SC and magnetism.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant No. 11474252), the National Key Research and Development Program of China (Grant No. 2016YFA0300202), and the Fundamental Research Funds for the Central Universities of China.
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Liu, Y., Liu, Y., Jiao, W. et al. Magnetism and superconductivity in Eu(Fe1−xNix)As2 (x = 0, 0.04). Sci. China Phys. Mech. Astron. 61, 127405 (2018). https://doi.org/10.1007/s11433-018-9284-3
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DOI: https://doi.org/10.1007/s11433-018-9284-3