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Room temperature epitaxial stabilization of a tetragonal phase in ( and Sr) thin films
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Image of FIG. 1.
FIG. 1.

Schematic representation of the heteroepitaxial growth of thin film on cubic substrate. The layer’s [001] and directions are aligned along [100] and [010] directions of the substrate.

Image of FIG. 2.
FIG. 2.

Reciprocal lattice maps of layers grown on (a) and (b) single crystal substrates. on clearly shows an orthorhombic unit cell, while layer on is tetragonal. Here we used , where is the Bragg angle and . Indices of the layer’s reflections are shown in bold.

Image of FIG. 3.
FIG. 3.

Schematic representation of (a) orthorhombic and (b) tetragonal structures of . In the orthorhombic SRO, octahedra are rotated counterclockwise about [010] and [001] directions and clockwise about [100] direction. In the tetragonal structure octahedra are rotated around [001] direction.

Image of FIG. 4.
FIG. 4.

Resistivity as a function of temperature of and thin films grown on different substrates. SRO on DSO and CRO on STO layers affected by a higher tensile strain are tetragonal and exhibit larger resistivity values, while orthorhombic SRO on STO and CRO on NGO layers show smaller resisitivity values.


Generic image for table
Table I.

Main structural parameters of and thin films grown on , , and single crystal substrates. and angles are equal to 90°.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Room temperature epitaxial stabilization of a tetragonal phase in ARuO3 (A=Ca and Sr) thin films