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

Abstract

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. Here we present a hole-compensation study by introducing extra itinerant electrons via a Ni substitution in the ferromagnetic superconductor RbEuFe${}_4$As${}_4$ with $T_{\mathrm{sc}}>T_{\mathrm{m}}$. With the Ni doping, $T_{\mathrm{sc}}$ decreases rapidly, and the Eu-spin ferromagnetism and its $T_{\mathrm{m}}$ remain unchanged. Consequently, the system RbEu(Fe${}_{1-x}$Ni${}_x$)${}_4$As${}_4$ transforms into a superconducting ferromagnet with $T_{\mathrm{m}}>T_{\mathrm{sc}}$ for $0.07\le x\le 0.08$. The occurrence of superconducting ferromagnets is attributed to the decoupling between Eu${}^{2+}$ spins and superconducting Cooper pairs. The superconducting and magnetic phase diagram is established, which additionally includes a recovered yet suppressed spin-density-wave state.

10 pages, 8 figures, 1 table

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Cited by in corpus (10)

• Coexisting spin resonance and long-range magnetic order of Eu in EuRbFe${}_4$As${}_4$
• Electronic structure of Ni-doped EuRbFe${}_4$As${}_4$: Unique crystal field splitting and multiband RKKY interactions
• Superconductivity and phase diagrams of CaK(Fe${}_{1-x}$Mn${}_x$)${}_4$As${}_4$ single crystals
• Pressure-temperature phase diagram of EuRbFe${}_4$As${}_4$ superconductor
• Antiferromagnetic resonances in twinned EuFe2As2 single crystal
• Magnetic and superconducting phase diagram of Eu(Fe${}_{1-x}$Ni${}_x$)As${}_2$
• Evolution from helical to collinear ferromagnetic order of the Eu${}^{2+}$ spins in RbEu(Fe${}_{1-x}$Ni${}_x$)${}_4$As${}_4$
• Muon spin rotation measurements on RbEuFe${}_4$As${}_4$ under pressure
• Superconductivity of Co-Doped CaKFe4As4 Investigated via Point-Contact Spectroscopy and London Penetration Depth Measurements
• Electron-beam Floating-zone Refined UCoGe