Berlin 2005 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 23: Posters Superconductivity, Solids at Low Temperature
TT 23.24: Poster
Montag, 7. März 2005, 14:00–18:00, Poster TU D
Angular resolved photoemission on Pb-Bi2201: Doping-dependent evolution of the pseudogap in the underdoped case — •L, Dudy1, B. Müller1, L. Lasogga1, A. Krapf1, H. Dwelk1, C. Janowitz1, R. Manzke1 und H. Höchst2 — 1Humboldt Universität zu Berlin, Institut für Physik, Newtonstr. 15, 12489 Berlin — 2Synchrotron Radiation Center (SRC), Madison/Wisconsin (USA)
In search for the pairing mechanism of the hole doped HTSCs there is still a debate about the pseudogap [1]. Some groups report a vanishing pseudogap around optimum doping [2]. Other measurements show in the overdoped region a smooth convergence of the pseudogap temperature with Tc, which gives the idea to treat the pseudogap state as a normal state precursor of the superconducting gap due to local, dynamic pairing correlations in a state without long range phase coherence[3]. An important point has been observed in the layered cuprates, which show that the pseudogap temperature T* is almost not dependent of the number of CuO layers[4]. We focus our work on measurements of the Pb and La doped one-layer Bi2201 single crystals. Here we present temperature dependent ARPES data from the optimum doped Pb-Bi2201 (Tc=32K) down to the strongly underdoped (Tc ∼ 0K) case. The data shows the evolution of the pseudogap temperature T* and the magnitude Δ* with respect to doping. [1] T. Timusk et al., Rep. Prog. Phys. 62 (1999), 61-122 [2] J.L. Tallon et. al., Physica C 282-287 (1997) 236-239 [3] V.J. Emery et al., Nature 374 (1995), 434 [4] T. Honma et al., cond-mat/0309597 (2003), accepted for Phys. Rev. B