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  • 1
    Publication Date: 2016-11-15
    Description: We report that epitaxial Sr 2 IrO 4 thin-films can be selectively grown using pulsed laser deposition (PLD). Due to the competition between the Ruddlesden-Popper phases of strontium iridates (Sr n+1 Ir n O 3n+1 ), conventional PLD methods often result in mixed phases of Sr 2 IrO 4 (n = 1), Sr 3 Ir 2 O 7 (n = 2), and SrIrO 3 (n = ∞). We have discovered that reduced PLD plume dimensions and slow deposition rates are the key for stabilizing pure Sr 2 IrO 4 phase thin-films, identified by real-time in-situ monitoring of their optical spectra. The slow film deposition results in a thermodynamically stable TiO 2 \\SrO\IrO 2 \SrO\SrO configuration at an interface rather than TiO 2 \\SrO\SrO\IrO 2 \SrO between a TiO 2 -terminated SrTiO 3 substrate and a Sr 2 IrO 4 thin film, which is consistent with other layered oxides grown by molecular beam epitaxy. Our approach provides an effective method for using PLD to achieve pure phase thin-films of layered materials that are susceptible to several energetically competing phases.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
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