Low Temperature Physics: 32, 305 (2006); https://doi.org/10.1063/1.2199430 (15 pages)
Физика Низких Температур: Том 32, Выпуск 4-5 (Апрель 2006), c. 411-429 ( к оглавлению , назад )
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
2Laboratoire CRISMAT, UMR CNRS-ENSICAEN(ISMRA) 6508, 6 Bld. du Maréchal Juin Bld., F-14050 Caen, France
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.
Ключевые слова: high-Tc superconductivity, Hubbard model, stripe phases.