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- W1498337682 abstract "We present heat-capacity measurements of the upper critical fields of single-crystal ${text{NdFeAsO}}_{1ensuremath{-}x}{text{F}}_{x}$. In zero-magnetic field a clear step in the heat capacity is observed at ${T}_{c}ensuremath{approx}47text{ }text{K}$. In fields applied perpendicular to the FeAs layers the step broadens significantly whereas for the in-plane orientation the field effects are small. This behavior is reminiscent of the ${text{CuO}}_{2}$-high-${T}_{c}$ superconductors and is a manifestation of pronounced fluctuation effects. Using an entropy conserving construction we determine the transition temperatures in applied fields and the upper critical-field slopes of $ensuremath{partial}{H}_{c2}^{c}/ensuremath{partial}T=ensuremath{-}0.72text{ }text{T}/text{K}$ and $ensuremath{partial}{H}_{c2}^{ab}/ensuremath{partial}T=ensuremath{-}3.1text{ }text{T}/text{K}$. Zero-temperature coherence lengths of ${ensuremath{xi}}_{ab}ensuremath{approx}3.7text{ }text{nm}$ and ${ensuremath{xi}}_{c}ensuremath{approx}0.9text{ }text{nm}$ and a modest superconducting anisotropy of $ensuremath{lambda}ensuremath{sim}4$ can be deduced in a single-band model." @default.
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- W1498337682 date "2008-10-30" @default.
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- W1498337682 title "Calorimetric determination of the upper critical fields and anisotropy of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>NdFeAsO</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>F</mml:mtext><mml:mi>x</mml:mi></mml:msub></mml:mrow></mml:math>single crystals" @default.
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- W1498337682 doi "https://doi.org/10.1103/physrevb.78.140510" @default.
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