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Title: Research into YBCO thin films grown on vicinal (001) STO substrates by pulsed laser deposition
Author: Balasubramaniam, U.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2009
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YBCO thin films were grown on c-axis and vicinal (001) STO substrates by pulsed laser deposition at the Cambridge Interdisciplinary Research Centre. The superconducting and structural properties of these films were examined by a variety of different analytical techniques. It was found that YBCO thin films grown on vicinal substrates required less energy (a lower laser fluence, or a lower deposition temperature) for optimal growth than the films grown on c-axis oriented substrates. A report on the effect the deposition rate had on the properties of the films is presented. It was found that to balance obtaining films with high Tcs and a smooth surface morphology, a deposition rate of 5Hz was required. Finally, experiments were conducted to observe how the film grows from nucleation to a chosen thickness of 200nm. YBCO thin films were grown to various thicknesses on 0°, 2° and 8° vicinal substrates to observe how the growth of films evolves and is influenced by the vicinal off-cut. The surface and properties of the films at these various thicknesses and on substrates of varying vicinality were analysed. It has been suggested in the literature that there is a critical thickness to consider, and this will be explained further in Chapter 6. The growth of the films on all three types of substrates was found to be very similar until this critical thickness is exceeded. A thickness range is determined where the formation of holes is believed to occur.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available