Prefer a chat interface with context about you and your work?
Nonexponential London Penetration Depth of FeAs-Based Superconducting<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>R</mml:mi><mml:msub><mml:mi>FeAsO</mml:mi><mml:mn>0.9</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="bold">F</mml:mi><mml:mn>0.1</mml:mn></mml:msub></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>R</mml:mi><mml:mo>=</mml:mo><mml:mi>La</mml:mi></mml:math>, Nd) Single Crystals
The superconducting penetration depth $\ensuremath{\lambda}(T)$ has been measured in $R{\mathrm{FeAsO}}_{0.9}{\mathrm{F}}_{0.1}$ ($R=\mathrm{La}$, Nd) single crystals ($R\mathrm{\text{\ensuremath{-}}}1111$). In Nd-1111, we find an upturn in $\ensuremath{\lambda}(T)$ upon cooling and attribute it to the paramagnetism of the Nd ions, similar to the case of the electron-doped cuprate Nd-Ce-Cu-O. After the correction for paramagnetism, the …