|Title:||Critical thickness and orbital ordering in ultrathin La(0.7)Sr(0.3)MnO(3) films|
Martin, L. W.
Chu, Y. -H.
Holcomb, M. B.
Blank, D. H. A.
Department of Materials Science and Engineering
|Abstract:||Detailed analysis of transport, magnetism, and x-ray absorption spectroscopy measurements on ultrathin La(0.7)Sr(0.3)MnO(3) 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 SrTiO(3) (001) substrate of only three unit cells (similar to 12 angstrom). Furthermore, linear-dichroism measurements demonstrate the presence of a preferred (x(2)-y(2)) 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.|
|Journal:||PHYSICAL REVIEW B|
|Appears in Collections:||Articles|