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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>โ</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
We present heat-capacity measurements of the upper critical fields of single-crystal ${\text{NdFeAsO}}_{1\ensuremath{-}x}{\text{F}}_{x}$. In zero-magnetic field a clear step in the heat capacity is observed at ${T}_{c}\ensuremath{\approx}47\text{ }\text{K}$. In fields applied perpendicular to the FeAs layers the step broadens significantly whereas for the in-plane orientation the field effects are small. This โฆ