4000 YBa_1tn2Cu_1tn3O_1tn7_1tn-_1tn_x63 thin films prepared by chemical solution deposition [Elektronische Ressource] / von Claudia Apetrii

YBa Cu O thin films prepared by2 3 7−xChemical Solution DepositionDissertationzur Erlangung des akademischen GradesDoctor rerum naturalium(Dr. rer. nat.)vorgelegtder Fakultät Mathematik und Naturwissenschaftender Technischen Universität DresdenvonDipl.-Ing. Claudia Apetriigeboren am 07.08.1979 in Brasov, RumänienEingereicht am 25.11.2009This page intentionally contains only this sentence.În memoria tatălui meuAbstractThe discovery of superconductivity in ceramic materials by Bednorz and Müller[2, 3] in early 1987, immediately followed by Wu et al. [4, 5] who showed thatYBa Cu O (YBCO) becomes superconducting (92K) well above the boiling2 3 7−xpoint of nitrogen (77K) created a great excitement in superconductivity research.Potential applications of high T -superconductors require large critical currents andchigh-applied magnetic fields. Effective ways to increase the critical current densityat high magnetic fields in YBCO are the introduction of nanoparticles and chemicalsubstitution of yttrium by other rare earth elements. Since low costs and envi-ronmental compatibility are essential conditions for the preparation of long lengthYBCO films, the cost effective chemical solution deposition (CSD) procedure wasselected, given that no vacuum technology is required.