Field-induced Commensurate-Incommensurate phase transition in a Dzyaloshinskii-Moriya spiral antiferromagnet
A. Zheludev, S. Maslov, and G. Shirane (BNL), Y. Sasago, N. Koide, and, K. Uchinokura (U. of Tokyo)
TL;DR
This study observes a magnetic phase transition in a Dzyaloshinskii-Moriya spiral antiferromagnet induced by an in-plane magnetic field, with experimental results aligning with theoretical predictions.
Contribution
It provides direct experimental evidence of a field-induced commensurate-incommensurate transition in a specific spiral magnet, confirming theoretical models.
Findings
Transition controlled by magnetic field strength
Quantitative agreement with theoretical models
Stable incommensurate period maintained during transition
Abstract
We report an observation of a commensurate-incommensurate phase transition in a Dzyaloshinskii-Moriya spiral magnet Ba_2CuGe_2O_7. The transition is induced by applying a magnetic field in the plane of spin rotation. In this experiment we have direct control over the strength of the commensurate potential, while the preferred incommensurate period of the spin system remains unchanged. Experimental results for the period of the soliton lattice and bulk magnetization as a function of external magnetic field are in quantitative agreement with theory.
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