Violation of the isotropic-$\ell$ approximation in overdoped La_{2-x}Sr_xCuO_4

Details Violation of the isotropic-$\ell$ approximation in overdoped La_{2-x}Sr_xCuO_4 Violation of the isotropic-$\ell$ approximation in overdoped La_{2-x}Sr_xCuO_4

2007-07-31

arxiv.org/abs/0707.4601v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.77.220502

Magnetotransport measurements on the overdoped cuprate La_{1.7}Sr_{0.3}CuO_4 are fitted using the Ong construction 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 $\ell$. This violation of the isotropic-$\ell$ approximation supports a picture of dominant small-angle elastic scattering in cuprates due to out-of-plane substitutional disorder. We show that both band anisotropy and anisotropy in the elastic scattering channel strongly renormalize the Hall coefficient in overdoped La_{2-x}Sr_xCuO_4 over a wide doping and temperature range.

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