arXiv:2010.09901cond-mat.supr-con
Observing the suppression of superconductivity in RbEuFe$_4$As$_4$ by correlated magnetic fluctuations
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Abstract
In this letter, we describe quantitative magnetic imaging of superconducting vortices in RbEuFe$_4$As$_4$ in order to investigate the unique interplay between the magnetic and superconducting sublattices. Our scanning Hall microscopy data reveal a pronounced suppression of the superfluid density near the magnetic ordering temperature in good qualitative agreement with a recently-developed model describing the suppression of superconductivity by correlated magnetic fluctuations. These results indicate a pronounced exchange interaction between the superconducting and magnetic subsystems in RbEuFe\textsubscript{4}As\textsubscript{4} with important implications for future investigations of physical phenomena arising from the interplay between them.
Superconductivity is not really a "yes or no" property. It can be destroyed by a too-strong external magnetic field, or, equivalently, a too-strong current. The quantitative side of this thing (i.e. what allows us to say "superconductivity is weakened") is "how strong is…
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