Cooperative response of magnetism and superconductivity in the magnetic superconductor RbEuF e4 A s4

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

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Abstract

We present a study of the magnetic-flux evolution in the magnetic superconductor RbEuFe4As4 performed using magneto-optical imaging and magnetization measurements during field cooling and warming and magnetic field cycling at temperatures above and below the magnetic transition point, Tm. The vortex patterns emerging at TâTm reveal that the Eu-spin subsystem serves as an internal pump of the magnetic flux while the superconducting critical current controls the delivery of magnetic-flux quanta into the bulk. The interplay of magnetic susceptibility amplifying the magnetic induction and vortex pinning attenuating the magnetic-flux entry results in a field-and temperature-dependent critical state that emulates a paramagnetic Meissner effect. The observed vortex dynamics corresponds to a nontrivial spatial current distribution and yields a self-consistent inhomogeneous enhancement of the sample magnetization.

Original languageEnglish
Article number104504
JournalPhysical Review B
Volume101
Issue number10
DOIs
Publication statusPublished - Mar 1 2020

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Vlasko-Vlasov, V. K., Welp, U., Koshelev, A. E., Smylie, M., Bao, J. K., Chung, D. Y., Kanatzidis, M. G., & Kwok, W. K. (2020). Cooperative response of magnetism and superconductivity in the magnetic superconductor RbEuF e4 A s4. Physical Review B, 101(10), [104504]. https://doi.org/10.1103/PhysRevB.101.104504