Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-12-19
Phys. Rev. B 69, 245108 (2004)
Physics
Condensed Matter
Strongly Correlated Electrons
11 pages, 17 figures, revised version as to appear in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.69.245108
We investigate charge ordering in the presence of electron-phonon coupling for quarter-filled ladder systems by using Exact Diagonalization. As an example we consider NaV2O5 using model parameters obtained from first-principles band-structure calculations. The relevant Holstein coupling to the lattice considerably reduces the critical value of the nearest-neighbor Coulomb repulsion at which formation of the zig-zag charge-ordered state occurs, which is then accompanied by a static lattice distortion. Energy and length of a kink-like excitation on the background of the distorted lattice are calculated. Spin and charge spectra on ladders with and without static distortion are obtained, and the charge gap and the effective spin-spin exchange parameter J are extracted. J agrees well with experimental results. Analysis of the dynamical Holstein model, restricted to a small number of phonons, shows that low frequency lattice vibrations increase the charge order, accompanied by dynamically produced zig-zag lattice distortions.
Aichhorn Markus
Ambrosch-Draxl Claudia
Evertz Hans Gerd
Hohenadler Martin
Sherman Ya. E.
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