Self-induced magnetic flux structure in the magnetic superconductor RbEuFe4As4

V. K. Vlasko-Vlasov*, A. E. Koshelev, M. Smylie, J. K. Bao, D. Y. Chung, M. G. Kanatzidis, U. Welp, W. K. Kwok

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


We report an unusual enhancement of the magnetic induction in single crystals of the magnetic superconductor RbEuFe4As4, 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.

Original languageEnglish (US)
Article number134503
JournalPhysical Review B
Issue number13
StatePublished - Apr 3 2019

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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