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Cross-sectional TEM and microanalysis were carried out to understand at a microscopic level the effects of microstructure and chemistry on the physical properties of manganites and manganite/cuprate films. TEM observations on pure LCMO grown on a (110) STO substrate were carried out first to determine the defect structure and detect any formation of second phase precipitates, as well as microstructural changes not detectable by X-ray reflections. La0.7Ca0.3MnO3 (LCMO) grows epitaxially on a (110) SrTiO3 (STO) substrate. HRTEM reveals a nearly defect-free interface between LCMO and STO with a few irregularly arranged misfit dislocations. The microstructure obtained from laser ablated nanometre scaled La0.7Ca0.3MnO3 (LCMO) / YBa2Cu3O7-δ (YBCO) / PrBa2Cu3O7 (PBCO) multilayers on (110) STO was also studied. Diffraction patterns show that all films grow epitaxially on top of the (110) STO substrate, with the c-axis of YBCO in plane. There is a roughness of about 10nm between PBCO and YBCO and the roughness is increased at the YBCO - LCMO interface.

Microstructural Characterisation of Cuprate / Manganate Films on (110) SrTiO3Deposited by Laser Ablation

Microstructural Characterisation of Cuprate / Manganate Films on (110) SrTiO₃Deposited by Laser Ablation