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Anisotropic scattering and anomalous normal-state transport in a high-temperature superconductor

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Abdel-Jawad, M., Kennett, M. P., Balicas, L., Carrington, A., Mackenzie, A. P., McKenzie, R. H., et al. (2006). Anisotropic scattering and anomalous normal-state transport in a high-temperature superconductor. Nature Physics, 2(12), 821-825. doi:10.1038/nphys449.

The metallic state of high-temperature copper-oxide superconductors, characterized by unusual and distinct temperature dependences in the transport properties(1-4), is markedly different from that of textbook metals. Despite intense theoretical efforts(5-11), our limited understanding is impaired by our inability to determine experimentally the temperature and momentum dependence of the transport scattering rate. Here, we use a powerful magnetotransport probe to show that the resistivity and the Hall coefficient in highly doped Tl2Ba2CuO6+delta originate from two distinct inelastic scattering channels. One channel is due to conventional electron electron scattering; the other is highly anisotropic, has the same symmetry as the superconducting gap and a magnitude that grows approximately linearly with temperature. The observed form and anisotropy place tight constraints on theories of the metallic state. Moreover, in heavily doped non-superconducting La2-xSrxCuO4, this anisotropic scattering term is absent(12), suggesting an intimate connection between the origin of this scattering and superconductivity itself.