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- W2021611687 abstract "We report on isofield magnetization curves obtained as a function of temperature in two single crystals of ${text{Ba}}_{1ensuremath{-}x}{text{K}}_{x}{text{Fe}}_{2}{text{As}}_{2}$ with superconducting transition temperature ${T}_{c}=28$ and 32.7 K. Results obtained for fields above 20 kOe show a well-defined rounding effect on the reversible region extending 1--3 K above ${T}_{c}(H)$ masking the transition. This rounding appears to be due to three-dimensional critical fluctuations, as the higher field curves obey a well known scaling law for this type of critical fluctuations. We also analyzed the asymptotic behavior of $sqrt{M}$ vs $T$ curves in the reversible region which probes the shape of the gap near ${T}_{c}(H)$. Results of the analysis suggests that phase fluctuations are important in ${text{Ba}}_{1ensuremath{-}x}{text{K}}_{x}{text{Fe}}_{2}{text{As}}_{2}$ which is consistent with nodes in the gap." @default.
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- W2021611687 date "2009-07-24" @default.
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- W2021611687 title "Superconducting fluctuations in the reversible magnetization of the iron-pnictide<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>Ba</mml:mtext></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mtext>K</mml:mtext><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mrow><mml:mtext>Fe</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>As</mml:mtext…" @default.
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- W2021611687 doi "https://doi.org/10.1103/physrevb.80.014518" @default.
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