On the soliton width in the incommensurate phase of spin-Peierls systems

TL;DR

This paper investigates how frustration and interchain elastic couplings affect soliton width in spin-Peierls systems, combining bosonization analysis with numerical exact diagonalization, and relates findings to experimental data on CuGeO3.

Contribution

It provides a theoretical and numerical analysis of factors influencing soliton width in spin-Peierls systems, highlighting the roles of frustration and elastic coupling.

Findings

Frustration reduces soliton width.

Interchain elastic coupling increases soliton width.

Results align with experimental measurements in CuGeO3.

Abstract

We study using bosonization techniques the effects of frustration due to competing interactions and of the interchain elastic couplings on the soliton width and soliton structure in spin-Peierls systems. We compare the predictions of this study with numerical results obtained by exact diagonalization of finite chains. We conclude that frustration produces in general a reduction of the soliton width while the interchain elastic coupling increases it. We discuss these results in connection with recent measurements of the soliton width in the incommensurate phase of CuGeO_3.