3 years ago

Off-Stoichiometric Transfer and Epitaxial Estabilization for Pulsed Laser Deposition of Sr$_{n+1}$Ir$_{n}$O$_{3n+1}$ Thin Films.

F. Rivadulla, L. Iglesias, B. Rodríguez-González, A. Gutiérrez-Llorente

The subtle balance of electronic correlations, crystal field splitting and spin-orbit coupling in layered Ir$^{4+}$ oxides can give rise to novel electronic and magnetic phases. Experimental progress in this field relies on the synthesis of epitaxial films of these oxides. However, the growth of layered iridates with excellent structural quality is a great experimental challenge. Here we report a synthetic approach that takes advantage of the off-stoichiometric transfer of material from a single stoichiometric Sr$_3$Ir$_2$O$_7$ pulsed laser deposition target to grow high-quality epitaxially strained films of Sr$_2$IrO$_4$, Sr$_3$Ir$_2$O$_7$ and SrIrO$_3$ on different substrates. Tuning background oxygen pressure and epitaxial strain these phases can selectively stabilize. We further investigate the thermoelectric properties of the films and propose that weak localization is responsible for the low temperature activated resistivity observed in SrIrO$_3$ under compressive strain.

Publisher URL: http://arxiv.org/abs/1711.02767

DOI: arXiv:1711.02767v1

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