Discussion of a spin-cluster model for the low temperature phase of NaV_2O_5

Details Discussion of a spin-cluster model for the low temperature phase of NaV_2O_5 Discussion of a spin-cluster model for the low temperature phase of NaV_2O_5

2000-08-10

arxiv.org/abs/cond-mat/0008172v2

Phys. Rev. B 62, R14613 (2000).

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, added a calculation of level repulsion

Scientific paper

10.1103/PhysRevB.62.R14613

We discuss magnetic excitations of a spin-cluster model which has been suggested to describe the low temperature phase of alpha'-NaV_2O_5. This model fulfills all symmetry criteria proposed by recent x-ray investigations. We find that this model is not able to describe the occurence of two well separated magnon lines perpendicular to the ladder direction as observed in INS experiments. We suggest further experimental analysis to generally distinguish between models with double reflection or inversion symmetry.

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