Fig. 1: Cuprate phase diagram and T-linear resistivity in Nd-LSCO and LSCO.
From: Electrons with Planckian scattering obey standard orbital motion in a magnetic field
a, Schematic temperature-doping phase diagram of the cuprate Nd-LSCO, showing the pseudogap phase (PG)16, the superconducting phase in zero field (SC), the charge-density-wave region (CDW)12,19,20 and roughly the region of strange metal behaviour (SM), distinct from the Fermi-liquid behaviour (FL). b, Temperature dependence of the in-plane resistivity ρ (J∥a) in a magnetic field B = 16 T normal to the copper oxide planes (B∥c), for our three cuprate samples, all with doping p = 0.24: Nd-LSCO (red), LSCO S1 (green) and LSCO S2 (blue). All three exhibit a perfect T-linear dependence below T ≈ 70 K, with a very similar slope. The residual resistivities extrapolated from a linear fit in the interval 20–70 K (dotted lines) are ρ0 = 28, 12 and 48 μΩ cm, respectively. The drop in ρ to zero below 10 K is due to superconductivity, not entirely suppressed at this relatively low field.
