Low Temperature Physics: 32, 305 (2006); https://doi.org/10.1063/1.2199430 (15 pages)
Fizika Nizkikh Temperatur: Volume 32, Number 4-5 (April 2006), p. 411-429    ( to contents , go back )

Stripe phases - possible ground state of the high-Tc superconductors

Marcin Raczkowski1,2, Andrzej M. Oleś 1, and Raymond Frésard 2

1Marian Smoluchowski Institute of Physics, Jagellonian University Reymonta 4, PL-30059 Kraków, Poland
E-mail: A.M.Oles@fkf.mpg.de

2Laboratoire CRISMAT, UMR CNRS-ENSICAEN(ISMRA) 6508, 6 Bld. du Maréchal Juin Bld., F-14050 Caen, France
pos Анотація:

Received November 1, 2005


Based on the mean-field method applied either to the extended single-band Hubbard model or to the single-band Peierls-Hubbard Hamiltonian we study the stability of both site-centered and bond-centered charge domain walls. The difference in energy between these phases is found to be small. Therefore, moderate perturbations to the pure Hubbard model, such as next nearest neighbor hopping, lattice anisotropy, or coupling to the lattice, induce phase transitions, shown in the corresponding phase diagrams. In addition, we determine for stable phases charge and magnetization densities, double occupancy, kinetic and magnetic energies, and investigate the role of a finite electron-lattice coupling. We also review experimental signatures of stripes in the superconducting copper oxides.

71.10.Fd - Lattice fermion models (Hubbard model, etc.)
71.27.+a - Strongly correlated electron systems; heavy fermions
74.25.-q - Properties of type I and type II superconductors
74.72.-h - Cuprate superconductors (high-Tc and insulating parent compounds)

Key words: high-Tc superconductivity, Hubbard model, stripe phases.

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