Resonant phonon coupling across the La{1-x}Sr{x}MnO{3}/SrTiO{3} interface

TL;DR

This study reveals how resonant phonon coupling at the La{1-x}Sr{x}MnO{3}/SrTiO{3} interface influences the film's electronic and magnetic properties, especially near the substrate's structural transition, through experimental and theoretical analysis.

Contribution

It demonstrates the mechanism of resonant phonon coupling across the interface and its impact on the ultrathin film's properties, a novel insight into interface-driven phenomena.

Findings

Sharp cusp in transport/magnetic properties at transition temperature

Resonant coupling between charge carriers and soft phonon mode

Phonon effects extend into the film's atomic layers

Abstract

The transport and magnetic properties of correlated La{0.53}Sr{0.47}MnO{3} ultrathin films, grown epitaxially on SrTiO{3}, show a sharp cusp at the structural transition temperature of the substrate. Using a combination of experiment and theory we show that the cusp is a result of resonant coupling between the charge carriers in the film and a soft phonon mode in the SrTiO{3}, mediated through oxygen octahedra in the film. The amplitude of the mode diverges towards the transition temperature, and phonons are launched into the first few atomic layers of the film affecting its electronic state.