Regensburg 2002 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 7: Postersitzung I: Anwendungen der Supraleitung (1-6), Dünne Schichten, Josephsonkontakte, SQUIDs (7-17), Neue und unkonv. Supraleiter(18-23), Amorphe- und Tunnelsyst. (24-28), Quantenflüssigkeiten (29-30), Syst. korr. Elektr.: Theorie I (31-45)

TT 7.34: Poster

Montag, 11. März 2002, 14:30–18:00, A

Pairing in ladder cuprates — •Satoshi Nishimoto¹, Eric Jeckelmann¹, and D.J. Scalapino² — ¹Philipps-Universität Marburg — ²University of California at Santa Barbara

The density-matrix renormalization group (DMRG) is used to study the properties of doped electrons and holes in a three-band Hubbard model for No-dq2-leg No-dqladder cuprates [1]. We investigate the role of the oxygen p-orbitals and their most important interactions (i.e., the on-site Coulomb repulsion and the nearest- and second-nearest-neighbor oxygen-oxygen hopping terms) in the parameter regime relevant for real materials such as Sr Cu₂ O₃. We consider both the usual 3-leg lattice Cu₂ (Cu₂ O₃)_L and a more realistic 5-leg lattice ( Cu₂ O₅)_L O₂ for ladder lengths up to L=32. We find that the system properties depend strongly on the oxygen interaction terms and differ significantly for the 3-leg and 5-leg systems. In particular, we will discuss the anisotropy of rung and leg interactions and the pairing of doped holes and electrons.

[1] E. Jeckelmann, D.J. Scalapino, and S.R. White, Phys. Rev. B 58, 9492 (1998).