Symmetry and dimension of the magnon dispersion of inorganic spin-Peierls systems

TL;DR

This paper analyzes the magnon dispersion in CuGeO_3, revealing a two-dimensional character and different symmetry than previously assumed, with implications for understanding spin-Peierls systems.

Contribution

It demonstrates the significance of two-dimensional effects and revises the symmetry assumptions in the magnon dispersion of inorganic spin-Peierls systems.

Findings

Magnon dispersion in CuGeO_3 has a 2D character.

The symmetry of the dispersion differs from previous models.

Interchain frustration may be more relevant than intrachain frustration.

Abstract

The data on the dispersion of the magnetic excitations of CuGeO_3 in the spin-Peierls dimerized phase are analyzed. On the basis of the lattice structure it is shown that even along the chains the $d=2$ character cannot be neglected. The symmetry of the dispersion differs from the one assumed so far. The magnetic resonance data is reinterpreted. The possibility of interchain rather than intrachain frustration is discussed.