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Influence of symmetry mismatch on heteroepitaxial growth of perovskite thin films
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Image of FIG. 1.
FIG. 1.

(a) Schematic of CRO structure showing both orthorhombic and pseudocubic unit cells. (b) RHEED images of (110) NGO and (001) LSAT substrates and CRO films on both substrates along two orthogonal in-plane directions at growth temperature. The arrows indicate the 001 reflection of orthorhombic unit cell.

Image of FIG. 2.
FIG. 2.

AFM images and section analysis profiles of (a) CRO on (110) NGO and (b) CRO on (001) LSAT.

Image of FIG. 3.
FIG. 3.

TEM images of CRO on (110) NGO: (a) single domain film, (b) HRTEM image and (c) SAED of in the interface. TEM images of CRO on (001) LSAT: (d) multidomain film with rough surface, (e) SAED and (f) HRTEM of domain wall and (g) of the interface.

Image of FIG. 4.
FIG. 4.

Four point resistivity measurements of orthogonal directions: in-plane and [001] directions of CRO on (110) NGO and CRO on (001) LSAT. Inset shows anomalous low temperature behavior.


Generic image for table
Table I.

Crystal structures and lattice parameters of CRO (Ref. 6), (110) NGO (Ref. 7), and (001) LSAT (Ref. 8) substrates. The pseudocubic structure is defined in Fig. 1. The lattice mismatch between the CRO film and NGO and LSAT substrates is shown along two orthogonal directions and on average.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Influence of symmetry mismatch on heteroepitaxial growth of perovskite thin films