Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 46: Superconductivity: Tunnelling, Josephson Junctions, SQUIDs 2

TT 46.5: Vortrag

Donnerstag, 29. März 2012, 19:00–19:15, H 2053

Measurements of single fluxon radiation spectra in annular Josephson junctions — •Kirill G. Fedorov and Alexey V. Ustinov — Physikalisches Institut and DFG Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology, D-76128 Karlsruhe, Germany

We report measurements of single fluxon radiation from annular Josephson junctions using a low noise cryogenic microwave amplifier. Measurements in the frequency domain show very rich fine structure of the fluxon current-voltage characteristic. Distinct resonances that are found in the fine structure are explained by fluxon interaction with small-amplitude plasma waves. The linewidth of fluxon radiation is investigated for different bias points and temperatures down to mK range. We present a comparison of the existing theories for fluxon radiation linewidth with our data.