Evolution from helical to collinear ferromagnetic order of the Eu$^{2+}$ spins in RbEu(Fe$_{1-x}$Ni$_{x}$)$_{4}$As$_{4}$
Qianhui Xu,
Yi Liu,
Sijie Hao
et al.
Abstract:The ground-state magnetic structures of the Eu 2+ spins in recently discovered RbEu(Fe1−xNix)4As4 superconductors have been investigated by neutron powder diffraction measurements. It is found that as the superconductivity gets suppressed with the increase of Ni doping, the magnetic propagation vector of the Eu sublattice diminishes, corresponding to the decrease of the rotation angle between the moments in neighboring Eu layers. The ferromagnetic Eu layers are helically modulated along the c axis with an inco… Show more
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