Forward Electron-Phonon Scattering and HTS

TL;DR

This paper discusses how forward electron-phonon scattering, enhanced by strong correlations in high-temperature superconductors, explains key properties of their normal and superconducting states, supported by spectroscopic evidence.

Contribution

It introduces the forward scattering peak mechanism, showing its role in the electron-phonon interaction in HTS oxides and its impact on their properties.

Findings

EPI is large in HTS oxides as shown by spectroscopy.

Strong correlations lead to a forward scattering peak at small doping.

FSP explains normal and superconducting state properties.

Abstract

Tunneling and point contact spectroscopy show clear phonon features and together with optic measurements give strong support that the electron-phonon interaction (EPI) is large in HTS oxides. Strong correlations in HTS oxides renormalize the EPI (and interaction with impurities) so that the forward scattering peak (FSP) develops for small hole doping \delta<<1. The FSP mechanism explains important properties of the normal and superconducting state.