Neutron scattering study of the field-induced soliton lattice in CuGeO$_3$

TL;DR

This neutron scattering study investigates the magnetic and structural properties of the field-induced soliton lattice in CuGeO₃, confirming theoretical predictions about soliton structure and behavior in high magnetic fields.

Contribution

The paper provides direct experimental evidence of a long-range magnetic soliton lattice in CuGeO₃ and compares the observed properties with theoretical models.

Findings

Confirmation of long-range magnetic soliton structure

Agreement of soliton width with theoretical estimates

Field dependence of incommensurability matches predictions

Abstract

CuGeO$_3$ undergoes a transition from a spin-Peierls phase to an incommensurate phase at a critical field of $H_c\approx 12.5$ T. In the high-field phase a lattice of solitons forms, with both structural and magnetic components, and these have been studied using neutron scattering techniques. Our results provide direct evidence for a long-ranged magnetic soliton structure which has both staggered and uniform magnetizations, and with amplitudes that are broadly in accord with theoretical estimates. The magnetic soliton width, $\Gamma$, and the field dependence of the incommensurability, $\delta k_{sp}$, are found to agree well with theoretical predictions.