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Fig.1: Photoemission spectra of optimally doped Bi 2 Sr 2-x La x CuO 6+ (x=0.40, T c =29 K) in the normal state at the
M-point of the Brillouin zone. Polarization dependence (a): Shown are two polarization geometries, where the
sample was kept fixed and the electrical field vector E of the linearly polarized synchrotron radiation has been
turned by 90°. T=35K, h=34eV, and E=30meV [2]. 90°-asymmetry (b): Shown are two spectra taken at
otherwise identical conditions at the two equivalent M-points (,0) and (0,). T=35K, h=22eV, and
E=16meV. Temperature dependence of weakly overdoped (BiPb) 2 Sr 2-x La x CuO 6+ (x=0.15, T c =25K) (c):
Shown are spectra taken near M at (0.75,0) for two temperatures, at T=10K where the double structure is very
pronounced and at T=90K it has vanished. The thick dotted curves in all three panels are the difference spectra.
References:
[1] C. Janowitz, R. Müller, L. Dudy, A. Krapf, R. Manzke, C. Ast, H. Höchst, Europhysics
Letters 60 (2002) 615
[2] R. Manzke, R. Müller, C. Janowitz, M. Schneider, A. Krapf, H. Dwelk, Phys. Rev. B
(Rapid Commun.) 63 (2001) 100504
[3] R. Claessen et al., Phys. Rev. Lett. 88, 096402 (2002)
[4] J. Voit, Euro. Phys. J. B 5 (1998) 505
[5] for an introduction see J. Orenstein, A.J. Millis, SCIENCE 288 (2000) 468 and references
therein
[6] for a review about the Pseudogap see T. Timusk und B. Statt Rep. Prog. Phys. 62, 61
(1999)
[7] T. Honma, P.H. Hor, H.H. Hsieh, M. Tanimoto, cond-mat/0309597, 2003