d-Wave superconductivity from correlated-hopping interactions determined by angle-resolved photoemission spectroscopy

Starting from a generalized Hubbard model with correlated-hopping interactions, we solve numerically two coupled integral equations within the Bardeen–Cooper–Schrieffer formalism, in order to study the doping effects on the critical temperature (TcTc), d-wave superconducting gap, and the electronic specific heat. Within the mean-field approximation, we determine the single- and correlated-electron-hopping parameters for La2 − xSrxCuO4 by using angle-resolved photoemission spectroscopy data. The resulting parametrized Hubbard model is able to explain the experimental TcTc variation with the doping level (x). Moreover, the observed power-law behavior of the superconducting specific heat is reproduced by this correlated-hopping Hubbard model without adjustable parameters.

► We obtain d  -wave superconductivity from correlated-hopping interactions. ► The model parameters are fitted by using the ARPES data. ► This model is able to explain the TcTc and specific heat behaviors of La2 − xSrxCuO4.