Thermal Decoupling: The Solution to the Mysteries of High-Tc Cuprate Superconductors - Part 2

In unconventional high-T_c cuprate superconductors, the intricate interplay between the non-ergodic bad metal and the strange metal state has remained enigmatic. Herein, we unravel this mystery using ab initio molecular dynamics (AIMD) simulations coupled with the temperature-dependent effective potential (TDEP) method. In this study, we found that thermal decoupling emerges as a pivotal underpinning behind several puzzling phenomena in high-T_c superconductivity. Our results indicate that the effective temperature on the BaO plane deviates from that of the CuO₂ plane at low temperatures. Furthermore, we delineate the correlation between thermal decoupling and the Planckian dissipation, rigorously and quantitatively revealing a profound connection between linear-T resistivity, Uemura plots, and superconducting domes, which are known to be the most important mysteries of high-T_c superconductivity. Thermal decoupling is also a key factor in understanding the relation the superconductivity and flat bands which is found in magic angle twisted bilayer graphene. Our discoveries offer a revolutionary perspective on high-T_c superconductivity, suggesting the potential for a transformative shift in our comprehension. Furthermore, they suggest that the autonomous emergence of low-temperature layers within materials has the potential to revolutionize industrial thermal management challenges.