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

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Abstract

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
Article number134503
JournalPhysical Review B
Volume99
Issue number13
DOIs
Publication statusPublished - Apr 3 2019

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Vlasko-Vlasov, V. K., Koshelev, A. E., Smylie, M., Bao, J. K., Chung, D. Y., Kanatzidis, M. G., Welp, U., & Kwok, W. K. (2019). Self-induced magnetic flux structure in the magnetic superconductor RbEuFe4As4. Physical Review B, 99(13), [134503]. https://doi.org/10.1103/PhysRevB.99.134503