Dresden 2011 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 2: Topical Session TEM I

MM 2.4: Talk

Monday, March 14, 2011, 12:15–12:30, IFW A

Scandate/Titanate Interfaces: Structure and Composition on the Atomic Scale — •Martina Luysberg¹, Jürgen Schubert², Kourosh Rahmanizadeh³, Gustav Bihlmayer³, Lena Fitting Kourkoutis⁴, and David A Muller⁴ — ¹Institute of Solid State Research IFF-8 and Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Research Centre Jülich, D-52425 Jülich, Germany — ²Institute of Bio- and Nanosystems and JARA-FIT, Research Centre Jülich, D-52425 Jülich, Germany — ³Institute of Solid State Research IFF-1, Research Centre Jülich, D-52425 Jülich, Germany — ⁴Applied and Engineering Physics, Cornell University, Ithaca, NY 14853, USA

When scandates and titanates are joint at an interface, a polar discontinuity occurs. Unlike the polar interface between LaAlO₃ and SrTiO₃, where a conducting interface has been discovered, the scandate-titanate heterojunctions remain electrical insulating. Recently we reported on an intermixing of the cations across the interface of DyScO₃ and SrTiO₃. This intermixing of ions of different valency counteracts the interface dipoles arising from the polar discontinuity, making the interface insulating. In the paper presented here we focus on an additional property of the interface: an ordered interface structure. High resolution electron microscopy and electron energy loss spectroscopy on individual atomic columns will be shown, which reveal an ordering on the Sr/RE (RE=Gd or Dy) sublattice. These results will be discussed in conjunction with ab-initio calculations.