Universality of T-linear and B-linear Planckian scattering rate in high-T_ccuprate superconductors

One of the major open questions in condensed matter physics is the microscopic origin of the quantum critical Planckian strange metal phase with universal T-linear scattering rate from which unconventional superconductivity directly emerges by lowering temperatures. Recently, the T-linear and B-linear resistivity have been simultaneously observed in the strange metal state of high-T_c cuprate superconductors, manifested by the universal field-to-temperature B/T-scaling in magneto-resistivity in k_BT >> μ_BB and μ_BB<< k_BT limits, respectively.

In this work, we establish the universality in T-linear and B-linear Planckian behaviors in LSCO near optimal doping. Experimentally, we observe the B-linear Planckian scattering rate and its relation to its T-linear counterpart. Thoeretically, we propose a common microscopic mechanism for this observation based on Kondo-like charge fluctuations near local quantum criticality of heavy-fermion formulated t-J model. Our analytically predicted universal B/T-scaling in scattering rate unifies these two phenomena, pointing toward a unified quantum-critical origin of Planckian transport in cuprates.