Search for dissertations about: "high temperature superconductors"

Showing result 1 - 5 of 83 swedish dissertations containing the words high temperature superconductors.

  1. 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

  2. 2. Hysteresis Modelling of High Temperature Superconductors

    Author : Mårten Sjöström; Mittuniversitetet; []
    Keywords : nonlinear modelling; Preisach model; hysteresis; superconductor;

    Abstract : .... READ MORE

  3. 3. Resistivity and the solid-to-liquid transition in high-temperature superconductors

    Author : Beatriz Espinosa Arronte; Magnus Andersson; Charles Simon; KTH; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; high-temperature superconductors; vortex dynamics; vortex solid-to-liquid transition; critical scaling; glass transition; Bose glass; heavy-ion irradiation; YBCO; Tl2Ba2CaCu2O8 d; oxygen deficiency.; Condensed matter physics; Kondenserade materiens fysik;

    Abstract : In high-temperature superconductors a large region of the magnetic phase diagram is occupied by a vortex phase that displays a number of exciting phenomena. At low temperatures, vortices form a truly superconducting solid phase which at high temperatures turns into a dissipative vortex liquid. READ MORE

  4. 4. High Temperature Superconducting and Tunable Ferroelectric Microwave Devices

    Author : Erik F. Carlsson; Chalmers University of Technology; []
    Keywords : varactors; tunable microwave circuits; conformal mapping; cryogenic probe station; ferroelectrics; high temperature superconductors; microwave circuits; narrow-band filters; phase-shifter;

    Abstract : This thesis addresses some applications of High Temperature Superconductors (HTS) and ferroelectric materials in tunable microwave devices and circuits. The work is divided into three main areas: i) modeling of multilayered structures including ferroelectric layers, ii) realization and characterization of tunable coplanar waveguides (CPW), capacitors and resonators based on ferroelectrics, and iii) an investigation of microstrip HTS K-band filters. READ MORE

  5. 5. Studies of magnetoresistance and Y substitutions in YBa2Cu3O7-delta high temperature superconductors

    Author : Magnus Andersson; Östen Rapp; Oystein Fischer; KTH; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; high-temperature superconductors; elctrical conductivity; magnetoresistance; measurement systems; YBa2Cu3O7; substitutional effects;

    Abstract : .... READ MORE