Resonant X-ray scattering and cooperative Jahn–Teller effect in LaMnO3 thin films

Abstract Epitaxial thin films of LaMnO3 were grown on MgO and SrTiO3. The cooperative Jahn–Teller transition occurred at different temperatures for the two films. It is shown that the intensity of the resonant (1 0 0) peak at the Mn K-edge is proportional to the 3 2 power of the orthorhombic strain for both films at all temperatures below the transition. This provides an evidence in favor of the band effect in accounting for the resonant scattering in LaMnO3. A significant intensity difference in the resonant scattering in the two films is pointed out.