Sökning: "Superconductivity"

Visar resultat 11 - 15 av 122 avhandlingar innehållade ordet Superconductivity.

  1. 11. Phase transitions in high-temperature superconductors

    Författare :Jack Lidmar; KTH; []
    Nyckelord :Superconductivity; Vortices; Phase transitions; Strongly correlated fermions; High-temperature superconductivity; Monte Carlo simulations.; TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : Thermal fluctuations and disorder strongly influence the behaviour of hightemperature superconductors. In particular the vortices play a key role in determining their properties. In this thesis the main focus lies on phase transitions, both in ultra-thin films and in three-dimensional systems, which are driven by vortex fluctuations. LÄS MER

  3. 12. Ordering and phase transitions in models of high temperature superconductors

    Författare :Jack Lidmar; KTH; []
    Nyckelord :superconductivity; vortices; phase transitions; strongly correlated fermions; high temperature superconductivity; TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : .... LÄS MER

  4. 13. Unraveling the cuprate superconductor phase diagram : Intrinsic tunneling spectroscopy and electrical doping

    Författare :Thorsten Jacobs; Vladimir Krasnov; Dominik Munzar; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Superconductivity; cuprates; intrinsic tunneling spectroscopy; Josephson junctions; mesa structures; micro nanoscale fabrication; electrical doping; pseudogap; Bi-2212; Bi-2201; fysik; Physics;

    Sammanfattning : High-temperature superconductors belong to the group of strongly correlated materials. In these compounds, complex repulsive electron interactions and a large number of degrees of freedom lead to a rich variety of states of matter. LÄS MER

  5. 14. Approaching the depairing critical current in superconducting YBa2Cu3O7−x nanowires

    Författare :Shahid Nawaz; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; YBCO; Superconductivity; HTS; Nanowires; NanoSQUIDs;

    Sammanfattning : The microscopic origin of High critical Temperature Superconductivity isstill an open issue in condensed matter physics. In these complex oxideselectrons self-organize in ways qualitatively different from those of conventionalmetals and insulators. LÄS MER

  7. 15. Phase transitions and vortex structures in multicomponent superconductors

    Författare :Karl Sellin; Egor Babaev; Astrid S. de Wijn; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; multicomponent superconductors; superconductivity; phase transitions; monte carlo; vortices; vortex structure formation; competing interactions;

    Sammanfattning : Theoretical aspects of multicomponent superconductivity and systemswith competing interactions are studied using Monte Carlo techniques.Motivated by recent experimental and theoretical results of complex struc-ture formation of vortices in multicomponent systems, possible vortex struc-ture formations due to vortex interactions that are not purely attractive orrepulsive are considered. LÄS MER