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36 papers · 1 filter
Orbital dynamics in ferromagnetic transition metal oxides
Jeroen van den Brink, Peter Horsch, Frank Mack +1
We consider a model of strongly correlated electrons interacting by superexchange orbital interactions in the ferromagnetic phase of LaMnO. It is found that the classical…
Effect of Nonmagnetic Impurities on the Magnetic Resonance Peak in YBa2Cu3O7
H. F. Fong, P. Bourges, Y. Sidis +6
The magnetic excitation spectrum of a YBa_2 Cu_3 O_7 crystal containing 0.5% of nonmagnetic (Zn) impurities has been determined by inelastic neutron scattering. Whereas in the pure…
A New Type of Electron Nuclear-Spin Interaction from Resistively Detected NMR in the Fractional Quantum Hall Effect Regime
S. Kronmueller, W. Dietsche, K. v. Klitzing +3
Two dimensional electron gases in narrow GaAs quantum wells show huge longitudinal resistance (HLR) values at certain fractional filling factors. Applying an RF field with frequenc…
Classical frustration and quantum disorder in spin-orbital models
J. Zaanen, L. F. Feiner, A. M. Oles
The most elementary of all physical spin-orbital models is the Kugel-Khomskii model describing a S=1/2, degenerate Mott-insulator. Recent theoretical work is reviewed reveali…
Double-exchange via degenerate orbitals
Jeroen van den Brink, Daniel Khomskii
We consider the double-exchange for systems in which doped electrons occupy degenerate orbitals, treating the realistic situation with double degenerate orbitals. We show tha…
Quantum Hall Effect induced by electron-electron interaction in disordered GaAs layers with 3D spectrum
S. S. Murzin, I. Claus, A. G. M. Jansen +3
It is shown that the observed Quantum Hall Effect in epitaxial layers of heavily doped n-type GaAs with thickness (50-140 nm) larger the mean free path of the conduction electrons…