Detailed analysis of transport, magnetism, and x-ray absorption spectroscopy measurements on ultrathin La0.7Sr0.3MnO3 films with thicknesses from 3 to 70 unit cells resulted in the identification of a lower critical thickness for a nonmetallic nonferromagnetic layer at the interface with the SrTiO3 (001) substrate of only three unit cells (~12 Å). Furthermore, linear-dichroism measurements demonstrate the presence of a preferred (x2-y2) in-plane orbital ordering for all layer thicknesses without any orbital reconstruction at the interface. A crucial requirement for the accurate study of these ultrathin films is a controlled growth process, offering the coexistence of layer-by-layer growth and bulklike magnetic/transport properties.
|Number of pages||7|
|Journal||Physical Review B (Condensed Matter and Materials Physics)|
|Publication status||Published - 2008|
Huijben, M., Martin, L. W., Chu, Y. H., Holcomb, M. B., Yu, P., Rijnders, A. J. H. M., ... Ramesh, R. (2008). Critical thickness and orbital ordering in ultrathin La0.7Sr0.3MnO3 films. Physical Review B (Condensed Matter and Materials Physics), 78(9), 094413-. https://doi.org/10.1103/PhysRevB.78.094413