Critical parameters from electrical resistance of nickel

Abstract

High-precision resistance measurements (rms relative error below 4 \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}7}$ per point) for nickel around ${T}_{c}$ are reported. When fitting the singular part of the resistance to the function ${R}_{s}=A{|t|}^{1\ensuremath{-}\ensuremath{\alpha}}(1+D{|t|}^{z})$, we obtain $\ensuremath{\alpha}=\ensuremath{-}0.095$, $\frac{A}{{A}^{\ensuremath{'}}}=\ensuremath{-}1.52$, $z=0.57$, and $\frac{D}{{D}^{\ensuremath{'}}}=\ensuremath{-}0.8$ within the temperature region $1.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}<|t|<12\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$. The cause of the rounding of experimental data close to ${T}_{c}$ is discussed.