Growth Mode of Superconducting La2-xSrxCul+yO4 Thin Films on LaAIO3 Substrate
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Abstract
La2-xSrxCul+yO4(LSCO) thin films sputtered from a Cu-rich target on a LaAIO3 substrate showed a columnar structure. The columnar grains penetrated the full thickness of the film, nucleating at the substrate surface defects. Transmission electron microscopy revealed two kinds of lattice images: one with a lattice spacing of 0.66 nm and the other with a spacing of 0.61 nm. The 0.66 nm spacing denotes a c-axis oriented LSCO film matrix. The 0.61 nm spacing has two categories: one with short white dashes, the phase of which is not yet identified, the other with no additional structure, which could correspond to the c-axis deviated LSCO.
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References
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