Inelastic X-ray scattering studies of phonon dispersions in superconductors at high pressures

TL;DR

This paper reviews recent advancements in inelastic X-ray scattering techniques used to study phonon dispersions in superconductors under high pressure, providing insights into electron-phonon interactions and phase transition mechanisms.

Contribution

It summarizes recent progress in high-resolution inelastic X-ray scattering methods and their application to understanding phonon behavior in superconductors under pressure.

Findings

Improved instrumentation enables routine high-pressure phonon studies.

Phonon anomalies correlate with electronic phase transitions.

Enhanced understanding of electron-phonon interactions in superconductors.

Abstract

Electron-phonon interaction is of central importance for the electrical and heat transport properties of metals, and is directly responsible for charge-density-waves or (conventional) superconducting instabilities. The direct observation of phonon dispersion anomalies across electronic phase transitions can provide insightful information regarding the mechanisms underlying their formation. Here, we review the current status of phonon dispersion studies in superconductors under hydrostatic and uniaxial pressure. Advances in the instrumentation of high resolution inelastic X-ray scattering beamlines and pressure generating devices allow these measurements to be performed routinely at synchrotron beamlines worldwide.