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    Critical Current Density Improvement in Type II Superconductors by Modifying the Type, Size and the Patterns of Pinning Centers

    , M.Sc. Thesis Sharif University of Technology Nazifi Takantapeh, Rana (Author) ; Vesaghi, Mohammad Ali (Supervisor) ; Fardmanesh, Mehdi (Supervisor)
    Abstract
    Motion of magnetic flux, as a result of exerting electrical current, causes dissipation and voltage difference in the type II superconducting slab. So fixing these vortices by pinning centers will increase the critical current . Enhancing the critical current by different kinds of pinning centers is interesting for a lot of theoretical and experimental research groups. At first in this project dynamics of vortices in a triangular lattice is investigated by changing the pinning force. For the case of fp=2f0 we have seen two phase transition in velocity-force plot. And also a practical pinning array of parallel lines is presented. The effect of pinning force, pinning potential width and the... 

    Vortex Dynamics in Magnetic Phase Diagram of High Tc Cuprate Oxides

    , M.Sc. Thesis Sharif University of Technology Taherian Fard, Hossein (Author) ; Khosroabadi, Hossein (Supervisor) ; Akhavan, Mohammad (Supervisor)
    Abstract
    In the 1950s, Abrikosov predicted the mixed state in superconductors (type II superconductors) which lead to a Noble Prize in 2003 with the experimental verification by shubnikov. Mixed-state is a network of magnetic flux lines with quantized flux (vortices) in superconductors. High-temperature superconductors are of Type II which the existense of vortices in a significant part of the temperature-field phase diagram of them, is an obvious phenomenon. These superconductors provided a proper context for understanding physical phenomena related to vortices and access to experimental data to compare with those provided by statistical mechanics. Vortices can move inside the superconductor by the...