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• W1567864555 abstract "The superconducting penetration depth, $lambda(T)$, has been measured in RFeAsO$_{0.9}$F$_{0.1}$ (R=La,Nd) single crystals (R-1111). In Nd-1111, we find an upturn in $lambda(T)$ 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 London penetration depth variation is found to follow a power-law behavior, $Delta lambda_L(T)propto T^{2}$ at low temperatures. The same $T^2$ variation of $lambda(T)$ was found in non-magnetic La-1111 crystals. Analysis of the superfluid density and of penetration depth anisotropy over the full temperature range is consistent with two-gap superconductivity. Based on this and on our previous work, we conclude that both the RFeAsO (1111) and BaFe$_2$As$_2$ (122) families of pnictide superconductors exhibit unconventional two-gap superconductivity." @default.
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• W1567864555 date "2009-06-18" @default.
• W1567864555 modified "2023-10-18" @default.
• W1567864555 title "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" @default.
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• W1567864555 doi "https://doi.org/10.1103/physrevlett.102.247002" @default.
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