Dresden 2011 – scientific programme

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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 Scheuch^1,2, Luca Perfetti³, Christian Frischkorn^1,2, 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 Bi₂Sr₂CaCu₂O_8+δ samples show the doping dependence of the superconducting gap. In addition a second doping-dependent kink at temperatures above the critical temperature T_c is observed. This feature correlates to the pseudo-gap as its temperature fits to the phase diagram obtained with other techniques.