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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 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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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. |
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ISSN: | 1674-7348 1869-1927 |
DOI: | 10.1007/s11433-018-9284-3 |