We report an observation of a commensurate-incommensurate phase transition in the Dzyaloshinskii-Moriya spiral antiferromagnet Ba(Formula presented). The transition is induced by an external magnetic field applied along the (Formula presented) axis of the tetragonal structure, i.e., in the plane of spin rotation. Bulk magnetic measurements and neutron-diffraction experiments show that the transition occurs in a critical field (Formula presented) T. Experimental results for the period of the magnetic structure and magnetization as functions of magnetic field are in quantitative agreement with our exact analytical solution for Dzyaloshinskii’s model of commensurate-incommensurate transitions in spiral magnets.
|Original language||English (US)|
|Number of pages||11|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - 1998|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics