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TT: Tiefe Temperaturen

TT 15: Postersitzung II: Elektronische Eigenschaften (1-12), Josephson-Kontakte (13-27), Heavy Fermions (28-40), Theorie HTSL (41-48), M-I-Überg
änge, Korrelierte Systeme (49-79)

TT 15.45: Poster

Mittwoch, 24. März 1999, 14:30–18:00, Foy

Mean field calculation on an SO(5) symmetric model and its comparison with the Hubbard model and experiments — •Marc Gaston Zacher, Enrico Arrigoni, and Werner Hanke — Institut für Theoretische Physik, Universität Würzburg, Am Hubland, 97074 Würzburg

We study an SO(5) symmetric model on a mean field level. Symmetry breaking terms are included in order to account for the Hubbard-Gap. The resulting gap-equations are solved numerically both in an AF- and dSC- broken symmetry phase. The d-wave like gap-modulation along the AF-Brillouin zone present in the solution of both phases is compared with recent experiments on Ca₂CuO₂Cl₂.
In addition we show Quantum-Monte-Carlo results for the Hubbard model without t^′-terms at half-filling and at a relatively high temperature where we observe this modulation as well.
We argue that the d-wave like gap modulation shown by experiments on the insulating parent compounds of High-T_c cuprates can be explained in the framework of SO(5) theory.