Regensburg 2002 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 11: Supraleitung: Elektronenstruktur, Phononen, Tunneln, Ordnungsparameter II
TT 11.5: Vortrag
Dienstag, 12. März 2002, 16:00–16:15, H19
Influence of the interlayer coupling on the electronic structure of the HTSC cuprates: an ARPES study. — •Sergey Borisenko1, Alexander Kordyuk1, Timur Kim1, Sibylle Legner1, Martin Knupfer1, Mark Golden1, Jorg Fink1, and Helmut Berger2 — 1Institute for Solid State Research, IFW-Dresden, P.O. Box 270016, D-01171 Dresden, Germany — 2Institut de Physique Appliquee, Ecole Politechnique Federale de Lausanne, CH-1015 Lausanne, Switzerland
Recent angle-resolved photoemission (ARPES) experiments allowed to identify the doubling of the band forming the Fermi surface in the two-layer BSCCO compounds. We study the influence of such splitting on the electronic structure under the different excitation conditions using unpolarized, linearly polarized and circularly polarized radiation of various energies. Bilayer splitting is explicitly resolved for the wide range of doping levels including the underdoped samples. We demonstrate that the famous peak-dip-hump line shape of the (pi,0) spectra taken in the superconducting state can be well explained in terms of the superposition of the bonding and antibonding components. We also report the momentum and energy distribution of the dichroic signal observed for both underdoped and overdoped samples. Difference in intensity of ARPES spectra taken with the light of positive and negative helicities turns out to be antisymmetric with respect to the reflections in both mirror planes and has an opposite sign for the bonding and antibonding components. A possible interpretation of the experimental results and their relation to the superconductivity in studied compounds is presented.