RbEu(Fe1−xNix)4As4: From a ferromagnetic superconductor to a superconducting ferromagnet

Yi Liu; Ya-Bin Liu; Ya-Long Yu; Qian Tao; Chun-Mu Feng; Guang-Han Cao

doi:10.1103/PhysRevB.96.224510

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RbEu(Fe1−xNix)4As4: From a ferromagnetic superconductor to a superconducting ferromagnet

Yi Liu, Ya-Bin Liu, Ya-Long Yu, Qian Tao, Chun-Mu Feng, Guang-Han Cao

DOI 10.1103/PhysRevB.96.224510 · Physical Review B

T1

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Abstract

The intrinsically hole-doped RbEuFe4As4 exhibits bulk superconductivity at Tsc=36.5 K and ferromagnetic ordering in the Eu sublattice at Tm=15 K. Here we present a hole-compensation study by introducing extra itinerant electrons via a Ni substitution in the ferromagnetic superconductor RbEuFe4As4 with Tsc>Tm. With the Ni doping, Tsc decreases rapidly, and the Eu-spin ferromagnetism and its Tm remain unchanged. Consequently, the system RbEu(Fe1−xNix)4As4 transforms into a superconducting ferromagnet with Tm>Tsc for 0.07≤x≤0.08. The occurrence of superconducting ferromagnets is attributed to the decoupling between Eu2+ spins and superconducting Cooper pairs. The superconducting and magnetic phase diagram is established, which additionally includes a recovered yet suppressed spin-density-wave state.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
RbEuFe4As4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	36.5	Pressure not reported	unknown
RbEu(Fe1-xNix)4As4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	36.4	Pressure not reported	midpoint
RbEu(Fe0.975Ni0.025)4As4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30.3	Pressure not reported	midpoint
RbEu(Fe0.95Ni0.05)4As4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	23	Pressure not reported	midpoint
RbEu(Fe0.94Ni0.06)4As4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	18.1	Pressure not reported	midpoint
RbEu(Fe0.93Ni0.07)4As4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	11.2	Pressure not reported	midpoint
RbEu(Fe0.92Ni0.08)4As4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.1	Pressure not reported	midpoint
RbSrFe4As4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	35.1	Pressure not reported	unknown