Electronic reconstruction at SrMnO$_{3}$-LaMnO$_{3}$ superlattice interfaces
ORAL
Abstract
Progress in molecular beam epitaxy made possible the growth of manganese oxide superlattices with the dopant ions arranged in separate regular layers. Little is known about how this ``structural'' doping is reflected into the MnO$_{2}$ planes; for instance what is the plane effective hole concentration. We studied superlattices made of SrMnO$_{3}$ and LaMnO$_{3}$ layers with a doping of x=0.33 using resonant soft x-ray scattering. For scattering momenta at which the non-resonant contribution is suppressed by symmetry, i. e. L=3 in units of the superlattice period, resonant soft x-ray scattering probes the distribution of doped holes, and, in particular, the nature of the interface between the doped and undoped layers. Our measurements at the O K edge show a temperature-dependent hole distribution. This electronic reconstruction which occurs with cooling below T$_{c}$ =220~K is related to the transition of the superlattice to a ferromagnetic state. Resonant scattering spectra at the Mn L edges from spin and orbital distributions have complex shapes providing additional insights into these new materials.
–
Authors
Serban Smadici
Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, IL 61801, USA
Peter Abbamonte
Dept. of Physics, F. Seitz Materials Research Laboratory, University of Illinois, Urbana-Champaign
Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, IL 61801, USA
University of Illinois
Anand Bhattacharya
Materials Science Division, Argonne National Laboratory
Materials Science Division (MSD), Argonne National Laboratory (Argonne)
Argonne National Laboratory, IL 60439, USA
Xiaofang Zhai
FS MRL, UIUC, IL 61801, USA
F. Seitz Materials Research Laboratory, University of Illinois, Urbana, IL
James Eckstein
University of Illinois, Urbana
Department of Physics and F Seitz Materials Research Laboratory, University of Illinois, Urbana
Department of Physics and Fredrick Seitz Materials Research Laboratory, University of Illinois, Urbana
FS MRL, UIUC, IL 61801, USA
University of Illinois at Urbana Champaign
Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801
Department of Physics, University of Illinois at Urbana-Champaign
