Abstract

Pulsed high-current experiments in single crystals of the high-${T}_{c}$ superconductor ${\text{Bi}}_{2}{\text{Sr}}_{2}{\text{CaCu}}_{2}{\text{O}}_{8+\ensuremath{\delta}}$ in a $c$-axis-directed magnetic field $H$ reveal that the $ab$-face resistance in the free flux flow regime is a solely logarithmic function of $H$, devoid of any power-law component. Reanalysis of published data confirms this result and leads to empirical analytical forms for the $ab$ plane and $c$ axis resistivities, ${\ensuremath{\rho}}_{ab}\ensuremath{\propto}{H}^{3/4}$, which does not obey the expected Bardeen-Stephen result for free flux flow and ${\ensuremath{\rho}}_{c}\ensuremath{\propto}{H}^{\ensuremath{-}3/4}\text{ }{\text{log}}^{2}\text{ }H$.

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