6 papers
Influence of the anion potential on the charge ordering in quasi-one dimensional charge transfer salts
Jose Riera, Didier Poilblanc
We examine the various instabilities of quarter-filled strongly correlated electronic chains in the presence of a coupling to the underlying lattice. To mimic the physics of the (T…
Evolution of the Spin Gap Upon Doping a 2-Leg Ladder
D. Poilblanc, O. Chiappa, J. Riera +2
The evolution of the spin gap of a 2-leg ladder upon doping depends upon the nature of the lowest triplet excitations in a ladder with two holes. Here we study this evolution using…
Low-energy excitations of spin-Peierls chains with modified bond-impurities
D. Augier, J. Riera, D. Poilblanc
The introduction of modified bond-defects in spin-Peierls systems is investigated in a model of antiferromagnetic Heisenberg spin chains coupled to adiabatic phonons. Generically,…
Antiferromagnetism in doped anisotropic two-dimensional spin-Peierls systems
A. Dobry, P. Hansen, J. Riera +2
We study the formation of antiferromagnetic correlations induced by impurity doping in anisotropic two-dimensional spin-Peierls systems. Using a mean-field approximation to deal wi…
Study of spin-Peierls transition in alpha'--NaV2O5 by infrared reflectivity
D. Smirnov, P. Millet, J. Leotin +4
Polarized infrared reflectivity measurements have been performed on single crystals of the spin-Peierls compound alpha'-NaV2O5 in the temperature range 20-300 K. Pronounced spectra…
Pair breaking by impurities in the two-dimensional t-J model
J. Riera, S. Koval, D. Poilblanc +1
Pair breaking mechanisms by impurities are investigated in the two-dimensional t-J model by exact diagonalization techniques. Analysis of binding energies, pairing correlations, dy…