Search for dissertations about: "high temperature superconductivity"

Showing result 1 - 5 of 62 swedish dissertations containing the words high temperature superconductivity.

  2. 1. Phase transitions in high-temperature superconductors

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

    Abstract : 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. READ MORE

  4. 2. Ordering and phase transitions in models of high temperature superconductors

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

    Abstract : .... READ MORE

  5. 3. On the Properties of Some Strongly Correlated Systems - Analytical and Numerical Studies

    Author : Jurij Smakov; KTH; []
    Keywords : mean field theory; magnetic multilayers; Curie temperature; compensation temperature; scanning tunneling microscopy; tunneling; superconductivity; local density of states; Josephson effect; tunneling Hamiltonian formalism; impurities in superconducto;

    Abstract : This thesis is dedicated to analytical and numerical studiesof a few models of strongly correlated systems and thedevelopment of techniques for such studies. The common name"strongly correlated" refers to systems in which theinteractions (correlations) between the constituent particleslead to nontrivial properties, such as various types ofmagnetism, superconductivity, and exotic phases. READ MORE

  6. 4. Selfconsistent theory of superconductivity in unconventional superconductors

    Author : Fabian Schrodi; Peter M. Oppeneer; Alex Aperis; Jörg Schmalian; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; superconductivity; unconventional; Eliashberg theory;

    Abstract : Superconductivity is broadly believed to stem from either electron-phonon interaction (EPI) or from purely electronic mechanisms, such as antiferromagnetic spin fluctuations. For many materials the discussion about which of these interactions is the dominant "pairing glue" is still ongoing. READ MORE

  7. 5. GaN-based HEMTs for Cryogenic Low-Noise Applications

    Author : Mohamed Aniss Mebarki; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cryogenic temperatures; superconductivity; RFI; High Electron Mobility Transistor HEMT ; Low Noise Amplifier LNA ; Niobium Nb ; Radio-astronomy; Gallium Nitride GaN ; high frequency;

    Abstract : Radio-astronomy deals with signals and radiations of extremely weak intensity. Also, it requires robust and rugged technologies able to sustain and prevent the Radio Frequency Interferences (RFI). READ MORE