Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 5: Postersession Superconductivity: Materials - Fabrication and Properties

TT 5.23: Poster

Montag, 23. März 2009, 13:00–16:45, P1A

Checking the band structure of Bi₂Sr₂CaCu₂O_8+δ on polarization dependencies via angle resolved photoemission spectroscopy — •Hendrik Vita, Beate Müller, Lenart Dudy, Stephan Thürmer, Christoph Janowitz, and Recardo Manzke — Humboldt-Universität zu Berlin, Institut für Physik, Newtonstr. 15, 12489 Berlin

High resolution angle resolved photoemission spectroscopy (ARPES) has been performed on Bi₂Sr₂CaCu₂O_8+δ, a classical representative of cuprate superconducters. With this approach the complex electronic structure of valence electrons in solids gets accessible. The excitation is generated by a high flux He-I_α ultaviolett source. Measuring the emitted electrons near zone boundary point M in reciprocal space, we focus on structures near the Fermi suface and around 1 eV binding energy. In particular linear polarized light is used, which is realized by a new monochromator equipped with a stage to rotate the orientation of the polarization. We assume that different excitations in the energy distribution curves show similar dependence on polarization. Especially for related systems like the single layer Bi₂Sr_2−xLa_xCuO_6+δ, phenomena measured in different polarization planes were already observed [1]. There the splitting of the superconducting peak up in two seperate excitations is reported. These measured structures are strongly correlated in respect to polarization.

[1] R. Manzke et. al., Phys. Rev. B 63, R100504 (2001)