Journal
NATURE COMMUNICATIONS
Volume 14, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41467-023-38762-5
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In this paper, researchers experimentally demonstrated the universal scaling properties of resistivity, optical conductivity, and optical effective mass of La2-xSrxCuO4 as a function of frequency and temperature. They also proposed a new theoretical framework to describe the unique properties of quantum critical matter.
Materials tuned to a quantum critical point display universal scaling properties as a function of temperature T and frequency omega.A long-standing puzzle regarding cuprate superconductors has been the observed power-law dependence of optical conductivity with an exponent smaller than one, in contrast to T-linear dependence of the resistivity and.-linear dependence of the optical scattering rate. Here, we present and analyze resistivity and optical conductivity of La2-xSrxCuO4 with x = 0.24. We demonstrate h omega/k(B)T scaling of the optical data over a wide range of frequency and temperature, T-linear resistivity, and optical effective mass proportional to similar to in T corroborating previous specific heat experiments. We show that a T, omega-linear scaling Ansatz for the inelastic scattering rate leads to a unified theoretical description of the experimental data, including the power-law of the optical conductivity. This theoretical framework provides new opportunities for describing the unique properties of quantum critical matter.
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