Scaling of the strange-metal scattering in unconventional superconductors

Article

关键词: NORMAL-STATE;    SPIN FLUCTUATIONS;    TEMPERATURE;    RESISTIVITY;    INSULATOR;   

DOI  :  10.1038/s41586-021-04305-5

来源: SCIE

【 摘 要 】

Marked evolution of properties with minute changes in the doping level is a hallmark of the complex chemistry that governs copper oxide superconductivity as manifested in the celebrated superconducting domes and quantum criticality taking place at precise compositions(1-4). The strange-metal state, in which the resistivity varies linearly with temperature, has emerged as a central feature in the normal state of copper oxide superconductors(5-9). The ubiquity of this behaviour signals an intimate link between the scattering mechanism and superconductivity(10-12). However, a clear quantitative picture of the correlation has been lacking. Here we report the observation of precise quantitative scaling laws among the superconducting transition temperature (T-c), the linear-in-T scattering coefficient (A(1)) and the doping level (x) in electron-doped copper oxide La2-xCexCuO4 (LCCO). High-resolution characterization of epitaxial composition-spread films, which encompass the entire overdoped range of LCCO, has enabled us to systematically map its structural and transport properties with unprecedented accuracy and with increments of Delta x = 0.0015. We have uncovered the relations T-c similar to (x(c) - x)(0.5) similar to (A(1)(rectangle))(0.5), where x(c) is the critical doping in which superconductivity disappears and A(1)(rectangle) is the coefficient of the linear resistivity per CuO2 plane. The striking similarity of the T-c versus A(1)(rectangle) relation among copper oxides, iron-based and organic superconductors may be an indication of a common mechanism of the strange-metal behaviour and unconventional superconductivity in these systems.

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