Lattice anisotropy as microscopic origin of static stripes in cuprates

Details Lattice anisotropy as microscopic origin of static stripes in cuprates Lattice anisotropy as microscopic origin of static stripes in cuprates

2001-02-12

arxiv.org/abs/cond-mat/0102201v1

Phys. Rev. B 64, 024521 (2001).

Physics

Condensed Matter

Strongly Correlated Electrons

18 pages, 16 figures, 8 tables

Scientific paper

10.1103/PhysRevB.64.024521

Structural distortions in cuprate materials offer a microscopic origin for anisotropies in electron transport in the basal plane. Using a real-space Hartree-Fock approach, we consider the ground states of the anisotropic Hubbard (t_x \ne t_y) and t-J (t_x \ne t_y, J_x \ne J_y) models. Symmetrical but inhomogeneous (``polaronic'') charge structures in the isotropic models are altered even by rather small anisotropies to one-dimensional, stripe-like features. We find two distinct types of stripe, namely uniformly filled, antiphase domain walls and non-uniform, half-filled, in-phase ones. We characterize their properties, energies and dependence on the model parameters, including filling and anisotropy in t (and J). We discuss the connections among these results, other theoretical studies and experimental observation.

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