Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-09-29
Physics
Condensed Matter
Strongly Correlated Electrons
30 pages, 12 figures, submitted to Phys. Rev. B
Scientific paper
We argue that in the quarter-filled ladder compound NaV_2O_5 the quasi-one-dimensional spin system is strongly coupled to a low-energy antiferroelectric mode of the excitonic type. This mode results from the interplay between the electron hopping along the rungs of the vanadium two-leg ladders and the Coulomb repulsion between electrons. The charge ordering observed in sodium vanadate at T_c = 34K corresponds to the softening of the antiferroelectric mode. We consider the spin-isospin model, which describes the spin and low-energy charge degrees of freedom in sodium vanadate. Within this model we explain the observed anomalous temperature-dependence of the dielectric susceptibility at T_c and the midinfrared absorption continuum. We identify the broad structure in the low-energy optical absorption spectrum of NaV_2O_5 with the continuum formed by two spinons and one low-energy charge excitation.
Khomskii Daniel I.
Knoester Jasper
Mostovoy Maxim V.
No associations
LandOfFree
Spin-Isospin Model of NaV_2O_5 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Spin-Isospin Model of NaV_2O_5, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spin-Isospin Model of NaV_2O_5 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-342899