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TT: Fachverband Tiefe Temperaturen

TT 28: FS: Time-Resolved Spectroscopy in Correlated Electron Systems:
Experiment and Theory

TT 28.7: Topical Talk

Donnerstag, 25. März 2010, 12:15–12:45, H18

Two-Component Dynamics of the Order Parameter of High Temperature Bi₂Sr₂CaCu₂O_8+δ Superconductors Revealed by Time-Resolved Raman Scattering — •Michael Alexander Rübhausen — Institut für Angewandte Physik & Center for Free Electron Laser Science, Universität Hamburg

We study the dynamics of the superconducting order parameter in the high-T_c cuprate Bi₂Sr₂CaCu₂O_8+δ by employing a novel time-resolved pump-probe Raman experiment. We find two different coupling mechanisms that contribute equally to the pair-breaking peak. One coupling sets in very fast at 2 ps and relaxes slowly, while the other one is delayed and sets in roughly at 5 ps and relaxes fast. A model that couples holes through phonons is able to reproduce one part of the condensate dynamics; thus, we argue that hole-spin interactions are of importance as well.

I will also give an brief outlook on future options to perform time resolved inelastic light scattering experiments with table top and free electron laser sources.

In collaboration with: R. P. Saichu, I. Mahns, A. Goos, S. Binder, P. May, S. G. Singer, B. Schulz, A. Rusydi, J. Unterhinninghofen, D. Manske, P. Guptasarma, M. S. Williamsen, and M. Rübhausen