226 citations · 573 across the 12 of their papers we have counts for
12 papers · 1 filter
Defect states and excitations in a Mott insulator with orbital degrees of freedom: Mott-Hubbard gap versus optical and transport gaps in doped systems
Adolfo Avella, Peter Horsch, Andrzej M. Oleś
We address the role played by charged defects in doped Mott insulators with active orbital degrees of freedom. It is observed that defects feature a rather complex and rich physics…
Fingerprints of spin-orbital entanglement in transition metal oxides
Andrzej M. Oleś
The concept of spin-orbital entanglement on superexchange bonds in transition metal oxides is introduced and explained on several examples. It is shown that spin-orbital entangleme…
Magnetic properties of nanoscale compass-Heisenberg planar clusters
F. Trousselet, A. M. Oles, P. Horsch
We study a model of spins 1/2 on a square lattice, generalizing the quantum compass model via the addition of perturbing Heisenberg interactions between nearest neighbors, and inve…
The apparent Fermi liquid concept helps to understand thermoelectric materials
Andrzej M. Oleś
Invited expert opinion on the article S. Kremer and R. Fresard, Ann. Phys. (Berlin) 524, 21 (2012).
The dimerized ferromagnetic Heisenberg chain
A. Herzog, P. Horsch, A. M. Oles +1
Ferromagnetic, in contrast to antiferromagnetic, Heisenberg chains can undergo a Spin-Peierls dimerization only at finite temperatures. They show reentrant behavior as a function o…
Magnetic excitations in one-dimensional spin-orbital models
A. Herzog, A. M. Oles, P. Horsch +1
We study the dynamics and thermodynamics of one-dimensional spin-orbital models relevant for transition metal oxides. We show that collective spin, orbital, and combined spin-orbit…
Compass-Heisenberg Model on the Square Lattice : Spin Order and Excitations
Fabien Trousselet, Andrzej M. Oles, Peter Horsch
We explore the physics of the anisotropic compass model under the influence of perturbing Heisenberg interactions and present the phase diagram with multiple quantum phase transiti…
Doping dependence of spin and orbital correlations in layered manganites
M. Daghofer, A. M. Oles, D. R. Neuber +1
We investigate the interplay between spin and orbital correlations in monolayer and bilayer manganites using an effective spin-orbital t-J model which treats explicitly the e_g orb…
Orbital Ordering and Orbital Fluctuations in Transition Metal Oxides
Andrzej M. Oles
We summarize some characteristic features of the frustrated magnetic interactions in spin-orbital models adequate for cubic transition metal oxides with orbital degeneracy. A gener…
Photoemission spectra of LaMnO3 controlled by orbital excitations
Jeroen van den Brink, Peter Horsch, Andrzej M. Oles
We investigate the spectral function of a hole moving in the orbital-ordered ferromagnetic planes of LaMnO, and show that it depends critically on the type of orbital ordering.…
Magnetic and orbital ordering in cuprates and manganites
A. M. Oles, M. Cuoco, N. B. Perkins
The mechanisms of magnetic and orbital interactions due to double exchange (DE) and superexchange (SE) in transition metal oxides with degenerate e_g orbitals are presented. Specif…
Electronic origin of magnetic and orbital ordering in insulating LaMnO_3
Louis Felix Feiner, Andrzej M. Oles
We derive a spin-orbital model for insulating LaMnO_3 which fulfills the SU(2) symmetry of S=2 spins at Mn^{3+} ions. It includes the complete e_g and t_{2g} superexchange which fo…