Persons at STU
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Basic information about a final thesisAdditional informationAdditional information about the final thesis follows. Click on the language link to display the information in the desired language.
|Language of final thesis:||English|
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|Title of the thesis:||Characterization of fine structure of superconducting layers in high temperature superconducting tapes|
|Summary:||The thesis is focused on the investigation of electromagnetic and structural properties of commercially produced superconducting (RE)BCO tapes. Tapes were produced by pulsed laser deposition (PLD), metal-organic chemical vapor deposition (MOCVD) and reactive co-evaporation (RCE) methods. The functional part of these tapes consists of complex oxide of barium, copper and rare earth elements (yttrium, gadolinium). Microstructural inhomogeneities (e.g. outgrowths) could affect the tape functionality either negatively (decrement of effective cross-section) or positively (effective pinning of vortices improving self-field and in-field properties). In the microstructure characterization, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and laser scanning confocal microscopy (LSCM) were used. Outgrowths and other features embedded in the superconducting layer showed impact on the current transport properties. Evident differences in distribution of elements, outgrowth morphology and density were observed between the investigated tapes. Tapes were electromagnetically characterized and good correlation between structural features and electromagnetic properties was found.
Additionally, the characterization of self-prepared thin superconducting films was studied. The films were prepared by PLD on the SrTiO3 substrates from YBCO targets with addition of 2.5% BYNO + 2.5% BYTO + 3.75% Y2O3. The reason of additions is to improve pinning properties by forming nano-pinning particles in the structures. The samples were prepared at different deposition temperatures, influencing significantly both structure and electrical properties.|
|Key words:||superconductivity, pulsed laser deposition (PLD), metal-organic chemical vapor deposition (MOCVD), reactive co-evaporation (RCE), high-temperature superconducting (HTS) tape, pinning|
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