Sökning: "Superconductivity"

Visar resultat 1 - 5 av 70 avhandlingar innehållade ordet Superconductivity.

  1. 1. Multicomponent superconductivity Vortex matter and phase transitions

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Johan Carlström; KTH.; [2013]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Superconductivity; Ginzburg Landau; field theory; Iron pnictide;

    Sammanfattning : The topic of this thesis is vortex-physics in multi component Ginzburg- Landau models. These models describe a newly discovered class of super- conductors with multiple superconducting gaps, and possess many properties that set them apart from single component models. LÄS MER

  2. 2. Mesoscopic superconductivity quasiclassical approach

    Detta är en avhandling från Umeå : Umeå universitet

    Författare :Marek Ožana; Umeå universitet.; [2001]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; mesoscopic superconductivity; quasiclassical theory; boundary conditions; multi-layer structures; Gor kov equations; quasiclassical Green s function; Green s function on classical trajectories;

    Sammanfattning : This Thesis is concerned with the quasiclassical theory of meso-scopic superconductivity. The aim of the Thesis is to introduce the boundary conditions for a quasiclassical Green’s function on partially transparent interfaces in mesoscopic superconducting structures and to analyze the range of applicability of the quasiclassical theory. LÄS MER

  3. 3. Nanocalorimetry of electronic phase transitions in systems with unconventional superconductivity and magnetic ordering

    Detta är en avhandling från Stockholm : Department of Physics, Stockholm University

    Författare :Donato Campanini; Stockholms universitet.; [2015]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Nanocalorimetry; Superconductivity; Magnetism; Electronic phase transitions; materiefysik; Physics Of Matter; Physics; fysik;

    Sammanfattning : In this thesis, low temperature specific heat measurements on small (μg) single crystals of different superconducting and magnetic systems are presented. The device used in this work features a combination of high sensitivity and good accuracy over the temperature range 1-400 K and allows measurements in high magnetic fields. LÄS MER

  4. 4. Phase transitions in high-temperature superconductors

    Detta är en avhandling från Stockholm : KTH

    Författare :Jack Lidmar; KTH.; [1998]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; 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

  5. 5. Ordering and phase transitions in models of high temperature superconductors

    Detta är en avhandling från Stockholm : KTH

    Författare :Jack Lidmar; KTH.; [1997]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; superconductivity; vortices; phase transitions; strongly correlated fermions; high temperature superconductivity; TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : .... LÄS MER