Self-induced Magnetic Flux Structure in the Magnetic Superconductor RbEuFe${}_4$As${}_4$

Abstract

We report an unusual enhancement of the magnetic induction in single crystals of the magnetic superconductor RbEuFe${}_4$As${}_4$ , highlighting the interplay between superconducting and magnetic subsystems in this material. Contrary to the conventional Meissner expulsion of magnetic flux below the superconducting transition temperature, we observe a substantial boost of the magnetic flux density upon approaching the magnetic transition temperature, Tm. Direct imaging of the flux evolution with a magneto-optical technique, shows that the magnetic subsystem serves as an internal magnetic flux pump, drawing Abrikosov vortices from the surface, while the superconducting subsystem controls their conveyance into the bulk of the magnetic superconductor via a peculiar self-organized critical state.

References in corpus (1)

• Superconductivity induced by phosphorus doping and its coexistence with ferromagnetism in EuFe${}_2$(As${}_{0.7}$P${}_{0.3}$)${}_2$

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• Novel magnetic stoichiometric superconductor EuRbFe4As4
• Magnetic and superconducting anisotropy in Ni-doped RbEuFe${}_4$As${}_4$ single crystals
• Effect of controlled artificial disorder on the magnetic properties of EuFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ ferromagnetic superconductor
• Magnetic and superconducting phase diagram of Eu(Fe${}_{1-x}$Ni${}_x$)As${}_2$
• Muon spin rotation measurements on RbEuFe${}_4$As${}_4$ under pressure
• Phenomenological theory of magnetic 90${}^{\circ }$ helical state
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