Abstract
Magnetotransport measurements on the overdoped cuprate ${\text{La}}_{1.7}{\text{Sr}}_{0.3}{\text{CuO}}_{4}$ are fitted using the Ong construction [Phys. Rev. B 43, 193 (1991)] and band parameters inferred from angle-resolved photoemission. Within a band picture, the low-temperature Hall data can only be fitted satisfactorily by invoking strong basal-plane anisotropy in the mean free path $\ensuremath{\ell}$. This violation of the isotropic-$\ensuremath{\ell}$ approximation supports a picture of dominant small-angle elastic scattering in cuprates due to out-of-plane substitutional disorder. We conjecture that both band anisotropy and anisotropy in the elastic-scattering channel strongly renormalize the Hall coefficient in ${\text{La}}_{2\ensuremath{-}x}{\text{Sr}}_{x}{\text{CuO}}_{4}$ across the entire overdoped regime.
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