274 citations · 3.3k across the 96 of their papers we have counts for
8 papers · 1 filter
Stripe phases - possible ground state of the high-Tc superconductors
Marcin Raczkowski, Andrzej M. Oles, Raymond Fresard
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-center…
Half-filled stripes in the t-t'-U Hubbard model
M. Raczkowski, A. M. Oles, R. Fresard
Using a self-consistent Hartree-Fock approximation we investigate the relative stability of various stripe phases in the extended -- Hubbard model. One finds that a negat…
Orbital and spin physics in LiNiO2 and NaNiO2
Albert J. W. Reitsma, Louis F. Feiner, Andrzej M. Oles'
We derive a spin-orbital Hamiltonian for a triangular lattice of e_g orbital degenerate (Ni^{3+}) transition metal ions interacting via 90 degree superexchange involving (O^{2-}) a…
Mean-field phase diagram of interacting e_g electrons
M. Raczkowski, A. M. Oles, R. Fresard
We investigate the magnetic phase diagram of the two-dimensional model for e_g electrons which describes layered nickelates. One finds a generic tendency towards magnetic order acc…
Interplay of orbitally polarized and magnetically ordered phases in doped transition metal oxides
R. Fresard, M. Raczkowski, A. M. Oles
We investigate the magnetic instabilities of the two-dimensional model of interacting e_g electrons for hole doping away from two electrons per site in the mean-field approximation…
Melting of the stripe phases in the t-t'-U Hubbard model
M. Raczkowski, R. Fresard, A. M. Oles
We investigate melting of stripe phases in the overdoped regime x>0.3 of the two-dimensional t-t'-U Hubbard model, using a spin rotation invariant form of the slave boson represent…