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5 papers · 1 filter
Heisenberg model with Dzyaloshinskii-Moriya interaction: A Schwinger boson study
L. O. Manuel, C. J. Gazza, A. E. Trumper +1
We present a Schwinger-boson approach to the Heisenberg model with Dzyaloshinskii-Moriya interaction. We write the anisotropic interactions in terms of Schwinger bosons keeping the…
Schwinger-boson approach to quantum spin systems: Gaussian fluctuactions in the "natural" gauge
A. E. Trumper, L. O. Manuel, C. J. Gazza +1
We compute the Gaussian-fluctuation corrections to the saddle-point Schwinger-boson results using collective coordinate methods. Concrete application to investigate the frustrated…
Ferromagnetism in Electronic Models for Manganites
Jose Riera, Karen Hallberg, Elbio Dagotto
Ground state properties of the Kondo model for manganese oxides in one dimension are studied using numerical techniques. The large Hund coupling () limit is specially analyz…
Rapid Suppression of the Spin Gap in Zn-doped CuGeO_3 and SrCu_2O_3
George Martins, Elbio Dagotto, José Riera
The influence of non-magnetic impurities on the spectrum and dynamical spin structure factor of a model for CuGeO is studied. A simple extension to Zn-doped …
Stability of correlated electronic systems under the influence of the electron-phonon interaction
A. Greco, A. Dobry
We have used an exact diagonalization technique to study the stability of the -Holstein and Hubbard-Holstein models under the influence of the electron-phonon interaction. Pre…