Unique interplay between superconducting and ferromagnetic orders in EuRbFe${}_4$As${}_4$

Abstract

Transport, magnetic and optical investigations on EuRbFe${}_4$As${}_4$ single crystals evidence that the ferromagnetic ordering of the Eu${}^{2+}$ magnetic moments at $T_N=15$ K, below the superconducting transition ($T_c=36$ K), affects superconductivity in a weak but intriguing way. Upon cooling below $T_N$, the zero resistance state is preserved and the superconductivity is affected by the in-plane ferromagnetism mainly at domain boundaries; a perfect diamagnetism is recovered at low temperatures. The infrared conductivity is strongly suppressed in the far-infrared region below $T_c$, associated with the opening of a complete superconducting gap at $2\Delta =10$ meV. A gap smaller than the weak coupling limit suggests the strong orbital effects or, within a multiband superconductivity scenario, the existence of a larger yet unrevealed gap.

4 pages, 5 figures

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• Vortex dynamic, pinning and irreversibility field investigation in EuRbFe4As4 superconductor
• Superconductivity driven helical magnetic structure in EuRbFe${}_4$As${}_4$ ferromagnetic superconductor
• Observing the suppression of superconductivity in RbEuFe${}_4$As${}_4$ by correlated magnetic fluctuations
• Helical structures in layered magnetic superconductors due to indirect exchange interactions mediated by interlayer tunneling
• Superconductivity-driven ferromagnetism and spin manipulation using vortices in the magnetic superconductor EuRbFe4As4
• Topological magnetic order and superconductivity in EuRbFe${}_4$As${}_4$
• Pressure-temperature phase diagram of EuRbFe${}_4$As${}_4$ superconductor
• Robust Superconductivity in Quasi-One-Dimensional Multiband Materials
• In-situ local imaging of ferromagnetism and superconductivity in RbEuFe${}_4$As${}_4$
• Spin waves and high-frequency response in layered superconductors with helical magnetic structure
• Competing ferromagnetic superconducting states in europium-based iron pnictides