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TT: Fachverband Tiefe Temperaturen
TT 10: Poster Session: Superconductivity
TT 10.33: Poster
Monday, March 14, 2011, 14:00–18:00, P4
Insights into the phase diagram of high-temperature superconductors obtained by terahertz spectroscopy — •Martin Scheuch1,2, Luca Perfetti3, Christian Frischkorn1,2, Martin Wolf2, and Tobias Kampfrath2 — 1Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin — 2Fritz-Haber-Institut der MPG, Faradayweg 4-6, 14195 Berlin — 3Laboratoire des Solides Irradiés, Ecole polytechnique, 91128 Palaiseau cedex, France
High resolution data of the electrons scattering rate τ−1(ω,T) in the range of 10 to 35 THz and 30 to 320 K measured by THz-transmission spectroscopy on optimally doped and underdoped Bi2Sr2CaCu2O8+δ samples show the doping dependence of the superconducting gap. In addition a second doping-dependent kink at temperatures above the critical temperature Tc is observed. This feature correlates to the pseudo-gap as its temperature fits to the phase diagram obtained with other techniques.