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- Eindhoven University of TechnologyNL56 papers
- Delft University of TechnologyNL21 papers
- Leiden UniversityNL20 papers
- Signify (Netherlands)NL18 papers
- Institute for Atomic and Molecular PhysicsNL14 papers
- NXP (Netherlands)NL13 papers
- Philips (Finland)FI9 papers
- Utrecht UniversityNL8 papers
- Max Planck Institute for Solid State ResearchDE7 papers
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- RWTH Aachen UniversityDE5 papers
9 papers · 1 filter
Evolution of Spin-Orbital-Lattice Coupling in the VO Perovskites
Peter Horsch, Andrzej M. Oles', Louis Felix Feiner +1
We introduce a microscopic model which unravels the physical mechanisms responsible for the observed phase diagram of the VO perovskites. It reveals a nontrivial interplay b…
Orbital liquid in ferromagnetic manganites: The orbital Hubbard model for electrons
Louis Felix Feiner, Andrzej M. Oles
We have analyzed the symmetry properties and the ground state of an orbital Hubbard model with two orbital flavors, describing a partly filled spin-polarized band on a cubic…
Spin-Orbital Entanglement and Violation of the Goodenough-Kanamori Rules
Andrzej M. Oles, Peter Horsch, Louis Felix Feiner +1
We point out that large composite spin-orbital fluctuations in Mott insulators with orbital degeneracy are a manifestation of quantum entanglement of spin and orbital vari…
Charge density waves in Sr_14-xCa_xCu_24O_41: electron correlations vs. structural effects
K. -Y. Choi, M. Grove, P. Lemmens +7
We report inelastic light scattering experiments in the spin-chain and ladder system Sr_14-xCa_xCu_24O_41. A depletion of an electronic background is observed for 0 < x < 5 at low…
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…
Quantum melting of magnetic long-range order near orbital degeneracy. Classical phases and Gaussian fluctuations
Andrzej M. Oles, Louis Felix Feiner, Jan Zaanen
We study the effective spin-orbital model derived for the d9 ions in a three-dimensional perovskite lattice, as in KCuF_3, where at each site the doubly degenerate eg orbitals cont…