Superconductivity and Ferromagnetism in Hole-Doped RbEuFe${}_4$As${}_4$

Abstract

We discover a robust coexistence of superconductivity and ferromagnetism in an iron arsenide RbEuFe${}_4$As${}_4$. The new material crystallizes in an intergrowth structure of RbFe${}_2$As${}_2$ and EuFe${}_2$As${}_2$, such that the Eu sublattice turns out to be primitive instead of being body-centered in EuFe${}_2$As${}_2$. The FeAs layers, featured by asymmetric As coordinations, are hole doped due to charge homogenization. Our combined measurements of electrical transport, magnetization and heat capacity unambiguously and consistently indicate bulk superconductivity at 36.5 K in the FeAs layers and ferromagnetism at 15 K in the Eu sublattice. Interestingly, the Eu-spin ferromagnetic ordering belongs to a rare third-order transition, according to the Ehrenfest classification of phase transition. We also identify an additional anomaly at $\sim$ 5 K, which is possibly associated with the interplay between superconductivity and ferromagnetism.

arXiv comment9 pages, 6 figures,the crystal structure parameters in Table 1 were corrected

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• Superconducting and magnetic phase diagram of RbEuFe4As4 and CsEuFe4As4 at high pressure
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• RbEu(Fe${}_{1-x}$Ni${}_x$)${}_4$As${}_4$: From a ferromagnetic superconductor to a superconducting ferromagnet
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• Observing the suppression of superconductivity in RbEuFe${}_4$As${}_4$ by correlated magnetic fluctuations
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• Electronic structure of Ni-doped EuRbFe${}_4$As${}_4$: Unique crystal field splitting and multiband RKKY interactions
• Helical structures in layered magnetic superconductors due to indirect exchange interactions mediated by interlayer tunneling
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• Anisotropic upper critical field of pristine and proton-irradiated single crystals of the magnetically ordered superconductor RbEuFe${}_4$As${}_4$
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• Robust Superconductivity in Quasi-One-Dimensional Multiband Materials
• Suppression of superconducting parameters by correlated quasi-two-dimensional magnetic fluctuations
• Magnetic and superconducting anisotropy in Ni-doped RbEuFe${}_4$As${}_4$ single crystals
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