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TT: Tiefe Temperaturen

TT 11: Postersitzung II (Metall-Isolator-Überg
änge, Phasenüberg
änge in Quantensystemen, Theorie: Systeme korrelierter Elektronen)

TT 11.40: Poster

Dienstag, 25. März 2003, 14:30–19:00, P2c, P2d

Charge dynamics in the CuO double chains of PrBa₂Cu₄O₈ — •Satoshi Nishimoto¹ and Yukinori Ohta² — ¹Philipps-Universität, FB Physik, 35032 Marburg — ²Department of Physics, Chiba University, Chiba 263-8522, Japan

Anomalous charge dynamics of low-dimensional strongly correlated electron systems has attracted much attention in physics of transition-metal oxides and organic conductors. Recently, the CuO double chains of PrBa₂Cu₄O₈ were found to provide an opportunity for studying the properties of charge dynamics such as charge ordering and charge fluctuations. We investigate the ground state and some excited states of a 1/4-filled CuO double chains numerically using the density-matrix renormalization group method. We show that the geometrical flustration can indeed induce a metal-insulator (MI) phase transition, and we present the ground-state phase diagram. Moreover, we discuss possible emergence of heavy-fermion-like behaviors near the MI transition as well as their doping dependence.