Fig. 4: Universal scaling between the slope of T2 resistivity (A) and Fermi energy (EF).
From: T-square resistivity without Umklapp scattering in dilute metallic Bi2O2Se
a Variation of A with EF on a Log–Log scale for Bi2O2Se: open magenta circles, compared to SrTiO3: solid blue squares7. b A − EF plot across various FLs, such as Metals: solid dark cyan triangles; strongly correlated metals including heavy Fermions: solid dark yellow diamonds and YBCO (YBa2Cu3Oy), Sr2RuO4, Ca3Co4O9: solid black pentagons; semimetals including Bi, Bi0.96Sb0.04, graphite, WTe2, Cd3As2, and ZrTe5: open wine hexagons; doped semiconductors including Bi2O2Se, SrTiO3, BaSnO3: open purple squares, CuRhO2: solid orange triangles, EuTiO3: solid navy star7,8,30,46,47. Most of the data are bounded by the two dashed lines set by Kadowaki–Woods and Rice, corresponding to a material-dependent length scale lquad ≈ 40 and 1.6 nm, respectively. The error bars for the data of Bi2O2Se denote the uncertainty in determining A and EF in processing the data. In solids with multiple Fermi surfaces, a horizontal bar links two data points representing the extrema in EF.
