Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 10: Superconductivity - Properties, Electronic Structure, Order Parameter
TT 10.9: Vortrag
Dienstag, 27. März 2007, 11:45–12:00, H18
Energy dependence of excitations near the Fermi surface in Bi(Pb)-2212 and Bi(Pb)-2201 — •B. Müller, L. Dudy, H. Dwelk, A. Krapf, C. Janowitz, and R. Manzke — Humboldt Universität Berlin, Institut für Physik, Newtonstr. 15, 12489 Berlin
In Bi derived HTc-cuprates the question of how many excitations occur near the Fermi surface is not yet completely answered. There are hints that more than the two peaks derived from bilayer-splitting are hidden in the well-known peak-dip-hump structure [1,2]. In our group it was previously argued that an additional polarisation dependent double-peak structure arises in the one- and two-layer Bi-cuprate [2]. In Bi(Pb)-2201 this can be traced unequivocally since there are no superstructure or bilayer effects possibly concealing this excitation. In Bi(Pb)-2212 the intensity ratio of the peak-dip-hump structure is energy dependent which could be a tool to uncover split excitations [1]. In this contribution the photon energy dependence of the excitations near the Fermi energy of Bi(Pb)-2212 and Bi(Pb)-2201 is studied.
[1] A.A. Kordyuk, S.V. Borisenko, T.K. Kim, K.A. Nenkov, M. Knupfer, J. Fink, M.S. Golden, H. Berger, R. Follath, Phys. Rev. Lett. 89 (2002) 077003
[2] R. Manzke, R. Müller, C. Janowitz, C. Ast, H. Höchst, Phys. Rev. B 63 (2001)R 100504; C. Janowitz, R. Müller, L. Dudy, A. Krapf, R. Manzke, C. Ast, H. Höchst, Europhys. Lett. 60 (2002) 615