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Magnetism and superconductivity in Eu(Fe1−xNix)As2 (x = 0, 0.04)

We report Eu-local-spin magnetism and Ni-doping-induced superconductivity (SC) in a 112-type ferroarsenide system Eu(Fe 1− x Ni x )As 2 . The non-doped EuFeAs 2 exhibits two primary magnetic transitions at ~100 and ~40 K, probably associated with a spin-density-wave (SDW) transition and an antiferro...

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Published in:Science China. Physics, mechanics & astronomy mechanics & astronomy, 2018-12, Vol.61 (12), p.127405, Article 127405
Main Authors: Liu, YaBin, Liu, Yi, Jiao, WenHe, Ren, Zhi, Cao, GuangHan
Format: Article
Language:English
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Summary:We report Eu-local-spin magnetism and Ni-doping-induced superconductivity (SC) in a 112-type ferroarsenide system Eu(Fe 1− x Ni x )As 2 . The non-doped EuFeAs 2 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 T c = 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(Fe 0.96 Ni 0.04 )As 2 , which provides a complementary playground for the study of the interplay between SC and magnetism.
ISSN:1674-7348
1869-1927
DOI:10.1007/s11433-018-9284-3