RbEu(Fe${}_{1-x}$Ni${}_x$)${}_4$As${}_4$: From a ferromagnetic superconductor to a superconducting ferromagnet

Yi Liu, Ya-Bin Liu, Ya-Long Yu +3

The intrinsically hole-doped RbEuFe${}_4$As${}_4$ exhibits bulk superconductivity at $T_{\mathrm{sc}}=36.5$ K and ferromagnetic ordering in the Eu sublattice at $T_{\mathrm{m}}=15$ K. He…