Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 29: Superconductivity: Mechanisms, Phase Diagram, Competing Order

TT 29.3: Vortrag

Donnerstag, 28. Februar 2008, 10:00–10:15, H 3010

Charge-carrier dynamics of high-T_c superconductors — •Martin Scheuch, Luca Perfetti, Tobias Kampfrath, Christian Frischkorn, and Martin Wolf — Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin

By using transient time-resolved THz spectroscopy, we get the full information of the complex conductivity of Bi₂Sr₂CaCu₂O_8+δ in the range from 8 to 30 THz. In addition to static measurements, we also performed femtosecond pump-probe experiments, where a visible pump pulse excites the sample and after variable time delay, the THz pulse measures the pump-induced change in the conductivity. This paves the way to observe the non-equilibrium states. Experiments are performed temperature-dependent from 5 to 300 K. Our results show the breaking of Cooper-pairs and their recovery. This will be discussed including electron cooling and phonon heating.