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Berlin 2005 – scientific programme

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TT: Tiefe Temperaturen

TT 16: Posters Correlated Electrons, Measuring Devices, Cryotechnique

TT 16.65: Poster

Saturday, March 5, 2005, 11:00–16:30, Poster TU C

Spin gap and charge order in weakly coupled quarter-filled ladders — •Bernhard Edegger1,2, Hans Gerd Evertz2, and Reinhard M. Noack31Theoretische Physik, Universität des Saarlandes — 2Insitut für Theoretische Physik, Technische Universität Graz — 3Fachbereich Physik, Philipps Universität Marburg

We present DMRG (Density Matrix Renormalization Group) calculations in quarter-filled ladders with model parameters relevant for NaV2O5. The properties of the low temperature phase are well described by including the coupling of the electrons to static lattice distortions in the extended Hubbard model. Charge order, charge gap and the effective magnetic exchange constant are determined. In addition, we show that a spin gap is induced by super-anti-ferroelectric charge order in weakly coupled quarter-filled ladders.

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