Study of Electron Density of States and Electronic Heat Capacity of High-temperature Cuprate Superconductor: La2−xSrxCuO4

Abstract

The renormalized electron density of states (REDOS) has been studied using quantum dynamical many-body theory of electron Green’s functions via model Hamiltonian and Born-Mayer-Huggins (BMH) potential. Different leading contributions due to harmonic phonons and electrons, their interactions, anharmonicities, and defects are included in the Hamiltonian. The cuprate superconductor La2−xSrxCuO4 has been taken up for numerical investigation purposes. The modified scenario of REDOS displays strong dependence on temperature. The results of REDOS have been utilized to investigate the electronic heat capacity (EHC). The REDOS and EHC are resolved into the isolated contributions coming from point impurities, electron-phonon interactions, and anharmonic modes. The obtained results of EHC concluding that EHC strongly affected by the contribution of defects, anharmonicities, and electron-phonon interactions and their amplitude are very small as per establish results. Thus, the considered effects show a substantial role in the study of REDOS and EHC and reveal some fascinating features.