Enhancement of magnetic order in the incommensurate phase of Mg-doped CuGeO$_{3}$

TL;DR

This study shows that high magnetic fields enhance antiferromagnetic order in Mg-doped CuGeO3, with solitons acting as impurities and leading to a disordered ground state with localized magnetic order.

Contribution

It provides new insights into magnetic order enhancement and soliton behavior in Mg-doped CuGeO3 under high magnetic fields.

Findings

Magnetic order increases with magnetic field in the incommensurate phase.

Magnetic Bragg peaks remain commensurate despite structural incommensurability.

Solitons act as effective doped impurities, influencing magnetic properties.

Abstract

We present elastic neutron scattering results at high magnetic fields for Mg-doped CuGeO$_{3}$. For low magnesium concentrations, where a spin-Peierls phase is present, we find an enhancement of the long range antiferromagnetic order in the structural incommensurate phase induced by a high magnetic field. In the incommensurate phase, the N\'eel temperature increases with field leading to a gain in the magnetic Bragg peak intensity at low temperatures. We also find that the magnetic Bragg peaks remain commensurate even though the structure is incommensurate at high magnetic fields due to the formation of solitons. We interpret these results in terms of the solitons formed at high-magnetic fields effectively acting as doped impurities. Our results point to a strongly disordered ground state with the the antiferromagnetic order localized around impurity sites.