Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 25: Superconductivity: Cuprate High-Temperature Superconductors 1
TT 25.12: Vortrag
Mittwoch, 25. März 2009, 12:30–12:45, HSZ 304
Two component dynamics of the superconducting order parameter revealed by time-resolved Raman scattering — •Ilka Mahns1, R. Pelangi Saichu1, Arne Goos1, Stephan Binder1, Patrick May1, Stefan G. Singer1, Benjamin Schulz1, Andrivo Rusydi1,2, Julia Unterhinninghofen3, Dirk Manske4, Prasenjit Guptasarma5, Mark S. Williamsen5, and Michael Ruebhausen1 — 1Institut fuer Angewandte Physik, Universitaet Hamburg, Germany. Center for Free Electron Laser Science (CFEL), Hamburg, Germany — 2Department of Physics, NUS, Singapore — 3Institut fuer Theoretische Physik, Universitaet Bremen, Germany — 4Max-Planck-Institut fuer Festkoerperforschung, Stuttgart, Germany — 5Department of Physics, University of Wisconsin,USA
The nature of the interaction between holes leading to superconductivity is encoded in the properties of the superconducting order parameter. These properties are reflected by the energy and the time scales on which the order parameter reacts to an external perturbation. Here, we present unique results detecting the dynamics of the superconducting order parameter in Bi-2212 by employing a time-resolved pump-probe Raman experiment. We find two different coupling mechanisms that contribute equally to the relaxation of the pair breaking peak. A model that couples holes through phonons is able to reproduce only one part of the condensate dynamics, thus, outlining also the importance of hole-spin interactions.