Search for dissertations about: "intrinsic Josephson junctions"

Showing result 6 - 10 of 11 swedish dissertations containing the words intrinsic Josephson junctions.

  2. 6. Superradiant THz wave emission from arrays of Josephson junctions

    Author : Ievgenii Borodianskyi; Vladimir Krasnov; Yury Shukrinov; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Josephson junction; Superconductor; ThZ emission; high-Tc; Physics; fysik;

    Abstract : High-power, continuous-wave, compact and tunable THz sources are needed for a large variety of applications. Development of power-efficient sources of electromagnetic radiation in the 0.1-10 THz range is a difficult technological problem, known as the “THz gap. READ MORE

  4. 7. Josephson Junctions: Oscillators and Broadband Spectrometers at Frequencies up to 1 THz

    Author : Jonas Edstam; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : This thesis is devoted to some selected applications of the Josephson junction oscillator. The initial work was performed using low-Tc Nb/PbBi tunnel junctions, while the later parts were done using the recently developed high-Tc YBa2Cu3O7 (YBCO) Josephson junctions. READ MORE

  5. 8. Transport Properties of Superconducting d-wave junctions

    Author : Tomas Löfwander; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : At surfaces and interfaces of d-wave superconductors, quasiparticle bound states with zero energy, midgap states (MGS), are necessarily formed as a consequence of the sign change of the d-wave order parameter upon 90° rotation. The MGS can never exist at s-wave superconductor surfaces and are therefore true fingerprints of unconventional superconductivity. READ MORE

  6. 9. Intrinsic tunneling spectroscopic investigations of Bi2Sr2CaCu2O8+x superconductors : The fluxon lattice, resonant phenomena,flux-flow and current doping

    Author : Holger Motzkau; Vladimir M. Krasnov; Paul Müller; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : In this thesis, the tunneling between individual atomic layers in structures of Bi2Sr2CaCu2O8+x based high-temperature superconductors are experimentally studied employing the intrinsic Josephson effect. A special attention is paid on the fabrication of small mesa structures using micro and nanofabrication techniques. READ MORE

  7. 10. Confinement and resonant phenomena in small Bi2Sr2CaCu2O8 mesa structures

    Author : Sven-Olof Katterwe; Vladimir M. Krasnov; Stockholms universitet; []
    Keywords : ;

    Abstract : In this thesis, intrinsic Josephson junctions, naturally formed in the stronglyanisotropic high-temperature superconductor Bi2Sr2CaCu2O8, are studied experimentally.Small mesa structures are fabricated on the surface of singlecrystals using micro- and nano-fabrication tools, focused ion beam is used toreduce the mesa-area to ≈ 1 × 1 μm2. READ MORE