Effects of Homogeneous Doping on Electron-Phonon Coupling in SrTiO₃.

ABSTRACT: Bulk n-type SrTiO₃ (STO) has long been known to possess a superconducting ground state at an exceptionally dilute carrier density. This has raised questions about the applicability of the BCS-Eliashberg paradigm with its underlying adiabatic assumption. However, recent experimental reports have set the pairing gap to the critical temperature (Tc) ratio at the BCS value for superconductivity in Nb-doped STO, even though the adiabaticity condition the BCS pairing requires is satisfied over the entire superconducting dome only by the lowest branch of optical phonons. In spite of the strong implications these reports have on specifying the pairing glue, they have not proved sufficient in explaining the magnitude of the optimal doping. This motivated us to apply density functional th

SUBMITTER: Park M 

PROVIDER: S-EPMC11767448 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature