Münster 1999 – wissenschaftliches Programm

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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 15.48: Poster

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

Influence of the band structure on the transition temperature and the pseudogap of high-temperature superconductors — •F. Schäfer, D. Manske, and K.H. Bennemann — Institut für Theoretische Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany

In electronic theories of high-temperature superconductors the nesting properties of the fermi surface play a crucial role for the pairing mechanism. Within a single-band Hubbard model of the CuO₂ planes we investigate the influence of the band structure on the spin-fluctuation-induced pairing interaction and the symmetry of the resulting order parameter. Spin fluctuation and the electronic properties are treated in a self-consistent way [1]. We discuss the influence of an orthorombic distortion on the three characteristic temperature scales, in particular the temperature T^* of the pseudogap, which were determined recently [2].

[1] N.E. Bickers, D.J. Scalapino, and S.R. White, Phys. Rev Lett. 62, 961 (1989).

[2] J. Schmalian, S. Grabowski, and K.H. Bennemann, Phys. Rev. B 56 R509 (1997).