Regensburg 2013 – scientific programme

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DS: Fachverband Dünne Schichten

DS 35: Application of Thin Films

DS 35.6: Talk

Friday, March 15, 2013, 10:45–11:00, H8

Growth of highly conductive SrMoO₃ as lattice matched oxide electrode material for (Ba,Sr)TiO₃ based thin film heterostructures — •Aldin Radetinac, Jürgen Ziegler, Mehran Vafaee, Philipp Komissinskiy und Lambert Alff — Materialwissenschaften, Technische Universität Darmstadt, Petersenstraße 23, 64287 Darmstadt, Germany

We have grown epitaxial heterostructures of Ba_0.6Sr_0.4TiO₃ and SrMoO₃ [1] by pulsed laser deposition on SrTiO₃ (001) substrates. A 5 nm thick interlayer of Ba_0.6Sr_0.4TiO_3−δ grown at low oxygen pressures and flow prevents oxidation of the conducting SrMoO₃ bottom electrode. Beneath this capping layer, a Mo⁴⁺ valence state fraction of 80% is maintained even after oxygen annealing as observed by X-ray photoelectron spectrometry (XPS). The described oxygen interface engineering allows fully epitaxial growth of the heterostructure enabling the future use of the novel highly conductive electrode material SrMoO₃ e.g. in tunable varactors.
This work was supported by the DFG projects GRK 1037 (TICMO) and KO 4093/1-1.

[1] A. Radetinac, K. S. Takahashi, L. Alff, M. Kawasaki, and Y. Tokura, Appl. Phys. Express 3, 073003(2010).