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Origin of the stabilization of the metastable tetragonal high-pressure phase in SrCuO2 thin films grown on SrTiO3 substrates by pulsed laser deposition.

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Title: Origin of the stabilization of the metastable tetragonal high-pressure phase in SrCuO2 thin films grown on SrTiO3 substrates by pulsed laser deposition.
Authors: Mihailescu, C.N.1,2, Pasuk, I.3, Straticiuc, M.4, Nita, C.R.4, Pantelica, D.4, Giapintzakis, J.1 giapintz@ucy.ac.cy
Source: Applied Surface Science. Nov2014, Vol. 320, p852-857. 6p.
Subjects: Strontium compounds, Stabilizing agents, Metastable states, High pressure physics, Thin films, Pulsed laser deposition, Substrates (Materials science)
Abstract: In this work we have systematically investigated the evolution of structure and stoichiometry in SrCuO 2 films grown on TiO 2 -terminated SrTiO 3 substrates as a function of the substrate temperature. Depending on the growth temperature SrCuO 2 /SrTiO 3 films can exhibit either a pure tetragonal high-pressure phase, or a pure orthorhombic low-pressure phase, or a mixed phase. Our results indicate that at low substrate temperatures the non-equilibrium state of the growth process is responsible for the stabilization of the metastable tetragonal high-pressure structure in SrCuO 2 thin films grown on ( 0 0 1) SrTiO 3 substrates, whose lattice matches the metastable structure. In addition, at higher substrate temperatures thermodynamics become dominant over other factors and the SrCuO 2 thin films are stabilized in the thermodynamically stable orthorhombic phase. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:In this work we have systematically investigated the evolution of structure and stoichiometry in SrCuO 2 films grown on TiO 2 -terminated SrTiO 3 substrates as a function of the substrate temperature. Depending on the growth temperature SrCuO 2 /SrTiO 3 films can exhibit either a pure tetragonal high-pressure phase, or a pure orthorhombic low-pressure phase, or a mixed phase. Our results indicate that at low substrate temperatures the non-equilibrium state of the growth process is responsible for the stabilization of the metastable tetragonal high-pressure structure in SrCuO 2 thin films grown on ( 0 0 1) SrTiO 3 substrates, whose lattice matches the metastable structure. In addition, at higher substrate temperatures thermodynamics become dominant over other factors and the SrCuO 2 thin films are stabilized in the thermodynamically stable orthorhombic phase. [ABSTRACT FROM AUTHOR]
ISSN:01694332
DOI:10.1016/j.apsusc.2014.09.116