%0 Journal Article
%T Universal T-linear resistivity and Planckian dissipation in overdoped cuprates
%J -
%D 2018
%R https://doi.org/10.1038/s41567-018-0334-2
%X The perfectly linear temperature dependence of the electrical resistivity observed as T£¿¡ú£¿0 in a variety of metals close to a quantum critical point1,2,3,4 is a major puzzle of condensed-matter physics5. Here we show that T-linear resistivity as T£¿¡ú£¿0 is a generic property of cuprates, associated with a universal scattering rate. We measured the low-temperature resistivity of the bilayer cuprate Bi2Sr2CaCu2O8+¦Ä and found that it exhibits a T-linear dependence with the same slope as in the single-layer cuprates Bi2Sr2CuO6+¦Ä (ref.£¿6), La1.6£¿xNd0.4SrxCuO4 (ref.£¿7) and La2£¿xSrxCuO4 (ref.£¿8), despite their very different Fermi surfaces and structural, superconducting and magnetic properties. We then show that the T-linear coefficient (per CuO2 plane), A1¡õ, is given by the universal relation A1¡õTF£¿=£¿h/2e2, where e is the electron charge, h is the Planck constant and TF is the Fermi temperature. This relation, obtained by assuming that the scattering rate 1/¦Ó of charge carriers reaches the Planckian limit9,10, whereby £¿/¦Ó£¿=£¿kBT, works not only for hole-doped cuprates6,7,8,11,12 but also for electron-doped cuprates13,14, despite the different nature of their quantum critical point and strength of their electron correlations
%U https://www.nature.com/articles/s41567-018-0334-2