Sökning: "High Temperature Superconductor HTS"

Visar resultat 1 - 5 av 8 avhandlingar innehållade orden High Temperature Superconductor HTS.

  1. 1. Device Technology Based on High Temperature Superconductors and Microwave Breakdown in Gases

    Författare :Martin Löfgren; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; distortion; penetration depth; surface resistance; transmit-receive switch; coupled-grain model; high-power; microwave; pulse; surface impedance; breakdown; propagation; modulator; air; superconductor; transmission line; resonator; coplanar waveguide; plasma;

    Sammanfattning : This thesis deals with two separate fields of microwave technology. The first section treats microwave characterization and applications of high temperature superconducting (HTS) thin films, while the second section treats microwave breakdown in transmit-receive (TR) switches and in air. Within the first section, four main topics are adressed. LÄS MER

  3. 2. Tunable Filters based on Ferroelectrics and Semiconductor Varactors

    Författare :Anders Eriksson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; High Temperature Superconductor HTS ; quality factor; tunable filter; phase transition; circular disc resonator; Cu BCB multilayer; KTaO3; ferroelectrics; dual mode filter; SrTiO3;

    Sammanfattning : Experimental investigation and development of tunable microwave filters, based on single crystals of SrTiO3 (STO) and KTaO3 (KTO), form the main work of this thesis. The dielectric properties of STO and KTO crystals are evaluated experimentally for a wide temperature range, with a DC bias, using parallel-plate resonators with High Temperature Superconductor (HTS) and normal metal (Cu) electrodes. LÄS MER

  4. 3. 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

  5. 4. Noise and electrical properties of YBCO nanostructures

    Författare :Edoardo Trabaldo; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; YBCO; noise; HTS; nanowire.; SQUID;

    Sammanfattning : This thesis work deals with the investigation of noise properties in cuprate High critical Temperature Superconductor (HTS) YBCO nanoscale devices. Here the aim is to get a better understanding of nanoscale fluctuations in the normal state of HTS from which superconductivity evolves. LÄS MER

  7. 5. Tunable resonators and filters based on bulk single crystal incipient ferroelectrics

    Författare :Anders Eriksson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; dual mode filter; tunable filter; STO; ferroelectrics; High Temperature Superconductor HTS ; KTO; phase transition; quality factor; circular single crystal disc resonator;

    Sammanfattning : .... LÄS MER