# Anisotropic Scattering and Anomalous Transport in a High Temperature Superconductor

Physics – Condensed Matter – Superconductivity

Scientific paper

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## Details Anisotropic Scattering and Anomalous Transport in a High Temperature Superconductor Anisotropic Scattering and Anomalous Transport in a High Temperature Superconductor

14 pages, 2 figures (plus Supplementary Information comprising 5 pages & 2 figures)

Scientific paper

The metallic state of high temperature cuprate superconductors is markedly different from that of textbook metals. The origin of this unconventional state, characterized by unusual and distinct temperature dependences in the transport properties, remains unresolved despite intense theoretical efforts. Our understanding is impaired by our inability to determine experimentally the temperature and momentum dependence of the transport scattering rate. Here we use a novel magnetotransport probe to show that the unusual temperature dependences of the resistivity and the Hall coefficient in highly doped Tl$_2$Ba$_2$CuO$_{6+\delta}$ originate from two distinct inelastic scattering channels. One channel is due to conventional electron-electron scattering whilst 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 put tight constraints on theories of the metallic state. Moreover, in heavily doped non-superconducting cuprates, this anisotropic scattering term appears to be absent, suggesting an intimate connection between the origin of this scattering and superconductivity itself.

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