The European Physical Journal B (EPJ B)

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Eur. Phys. J. B 46, 309-314 (2005)
DOI: 10.1140/epjb/e2005-00263-7

Effects of the doping and the number of planes on the shadow bands of Bi-based cuprates

M. Izquierdo^{1, 2}, L. Roca^{1, 3}, J. Avila^{1, 3}, G. Gu⁴, Z.Z. Li⁵, H. Raffy⁵ and M.C. Asensio^{2, 3}

¹ LURE - Centre Universitaire Paris-Sud, Bât. 209D, 91898 Orsay Cedex, France
² Synchrotron SOLEIL- L'Orme des Merisiers, 91192 Gif-sur-Yvette Cedex, France
³ Instituto de Ciencia de Materiales - CSIC, 28049 Madrid, Spain
⁴ Brookhaven National Laboratory - Physics Department, Building 510B, Upton, New York 11975-5000, USA
⁵ Laboratoire des Physiques des Solides - Centre Universitaire Paris-Sud, Bât. 510, 91405 Orsay Cedex, France

manuel.izquierdo@synchroton-soleil.fr

(Received 20 January 2005 / Received in final form 29 April 2005 / Published online 18 August 2005)

Abstract
Angle resolved photoemission spectroscopy (ARPES) has been used to investigate the shadow bands present at the Fermi surface of bismuth based superconductors. Bi₂Sr₂CaCu₂O $_{8+\delta}$ (Bi2212) single crystals with different doping levels and Bi₂Sr₂CuO $_{6+\delta}$ (Bi2201) thin films have been studied by means of momentum distribution curves along the $\Gamma$ Y high symmetry direction in two different Brillouin zones and for an extensive photon energy range. The results show an enhancement of the shadow band intensity in the second Brillouin zone for photon energies around $h\nu=30$ eV. Furthermore, the ratio Shadow Bands/Main Band is shown to be constant as a function of both the doping level and the number of CuO₂ planes. An interpretation of this observation on the basis of the current theoretical models will be provided.

PACS
74.72.-h - Cuprate superconductors (high-T_c and insulating parent compounds).
71.18.+y - Fermi surface: calculations and measurements; effective mass, g factor.

© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2005