Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 26: Korrelierte Elektronen: Theorie II

TT 26.13: Vortrag

Donnerstag, 11. März 2004, 12:45–13:00, H18

Low-energy physics of cuprates beyond the standard pdσ-model — •S.-L. Drechsler¹, J. Málek¹, H. Rosner², A.S. Moskvin³, H. Eschrig¹, M. Knupfer¹ und A. Kordyuk¹ — ¹IFW-Dresden, P.O. Box 270116, D-01171 Dresden, Germany — ²MPI-CPfS Dresden, Germany — ³Ural St.ate University, 620083 Ekaterinburg, Russia

The role of orbitals beyond the Cu 3dO2p set employed in the widely used standard pdσ extended Hubbard model is considered with respect to the low-energy physics of several cuprates and different experiments. Special attention is paid to the theoretical description of the loss function and optical conductivity data of the 1D compound Sr₂CuO₃ and the 2D system Sr₂CuO₂Cl₂ with respect to excited O 2π states. Consequences for the orbital character of doped holes are considered. Effects of Cu 4s orbitals and states derived from cations outside the CuO₂ planes are discussed with respect to the observed bi-layer splitting in Bi2212 [1], the Néel state ordering in CaCuO₂, and NMR data of La₂CuO₄ [2].

[1] A.A. Kordyuk et al., cond-mat/0311137

[2] E.P. Stoll et al., Int. J. of Mod. Phys. 17, 3329 (2003).