Room-temperature-superconducting Tc driven by electron correlation

Room-temperature-superconducting T_c measured by high pressure in hydrides can be theoretically explained by a Brinkman-Rice (BR)-Bardeen-Cooper-Schrieffer (BCS) T_c combining both the generalized BCS T_c and the diverging effective mass, m*/m = 1/(1 − (U/U_c)²), with the on-site Coulomb interaction U in the BR picture. A transition from U in a correlated metal of the normal state to U_c in the superconducting state can lead to superconductivity, which can be caused by volume contraction induced by high pressure or low temperature.