Volume 85, Number 2, January 2009
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||30 January 2009|
Dimensional crossover in Sr2RuO4 within a slave-boson mean-field theory
Institute for Theoretical Physics, ETH Zürich - CH-8093 Zürich
Corresponding author: email@example.com
Accepted: 5 January 2009
Motivated by the anomalous temperature dependence of the c-axis resistivity of Sr2RuO4, the dimensional crossover from a network of perpendicular one-dimensional chains to a two-dimensional system due to a weak hybridization between the perpendicular chains is studied. The corresponding two-orbital Hubbard model is treated within a slave-boson mean-field theory (SBMFT) to take correlation effects into account such as the spin-charge separation on the one-dimensional chains. Using an RPA-like formulation for the Green's function of collective spinon-holon excitations the emergence of quasiparticles at low-temperatures is examined. The results are used to discuss the evolution of the spectral density and the c-axis transport within a tunneling approach. For the latter a regime change between low- and high-temperature regime is found in qualitative accordance with experimental data.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 71.10.Pm – Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.) / 71.10.Fd – Lattice fermion models (Hubbard model, etc.)
© EPLA, 2009
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