115 citations · 630 across the 16 of their papers we have counts for
14 papers · 1 filter
Thermally activated Peierls dimerization in ferromagnetic spin chains
J. Sirker, A. Herzog, A. M. Oles +1
We demonstrate that a Peierls dimerization can occur in ferromagnetic spin chains activated by thermal fluctuations. The dimer order parameter and entanglement measures are studied…
Frustration and entanglement in the spin--orbital model on a triangular lattice: valence--bond and generalized liquid states
Bruce Normand, Andrzej M. Oles
We consider the spin--orbital model for a magnetic system with singly occupied but triply degenerate orbitals coupled into a planar, triangular lattice, as would be exempl…
Absence of Hole Confinement in Transition Metal Oxides with Orbital Degeneracy
M. Daghofer, K. Wohlfeld, A. M. Oles +2
We investigate the spectral properties of a hole moving in a two-dimensional Hubbard model for strongly correlated t_2g electrons. Although superexchange interactions are Ising-lik…
Origin of the Verwey transition in magnetite: Group theory, electronic structure, and lattice dynamics study
Przemyslaw Piekarz, Krzysztof Parlinski, Andrzej M. Oles
The Verwey phase transition in magnetite has been analyzed using the group theory methods. It is found that two order parameters with the symmetries and induce the stru…
Unidirectional d-wave superconducting domains in the two-dimensional t-J model
Marcin Raczkowski, Manuela Capello, Didier Poilblanc +2
Motivated by the recently observed pattern of unidirectional domains in high-T_c superconductors [Y. Kohsaka et al., Science 315, 1380 (2007)], we investigate the emergence of spon…
Spin-orbital entanglement near quantum phase transitions
Andrzej M. Oles, Peter Horsch, Giniyat Khaliullin
Spin-orbital entanglement in the ground state of a one-dimensional SU(2)SU(2) spin-orbital model is analyzed using exact diagonalization of finite chains. For spin…