Frustration induced Raman scattering in CuGeO_3

TL;DR

This paper combines experimental Raman scattering data with theoretical models to explore the spin-Peierls state in CuGeO_3, revealing a novel dimerization and interchain coupling effects.

Contribution

It introduces a combined experimental and theoretical approach using exact diagonalization and solitonic mean field theory to analyze Raman scattering in CuGeO_3.

Findings

Good agreement between 1D theory and experimental data

Evidence for a novel dimerization of the Raman operator

Coupling between interchain exchange and magnetic excitations

Abstract

We present experimental data for the Raman intensity in the spin-Peierls compound CuGeO_3 and theoretical calculations from a one-dimensional frustrated spin model. The theory is based on (a) exact diagonalization and (b) a recently developed solitonic mean field theory. We find good agreement between the 1D-theory in the homogeneous phase and evidence for a novel dimerization of the Raman operator in the spin-Peierls state. Finally we present evidence for a coupling between the interchain exchange, the spin-Peierls order parameter and the magnetic excitations along the chains.