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

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

2011-02-20

arxiv.org/abs/1102.4048v2

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevLett.107.105501

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.

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