Abstract
The magnetic phase diagram of a quasi-two-dimensional antiferromagnet with an equilateral triangular lattice structure is studied with NMR and neutron-diffraction techniques. This combination of experimental techniques allows us to determine the ordered components of the magnetic moments on the ions within various high-field phases—the Y, UUD, V, and fan structures, stabilized in the compound by the in-plane magnetic field. It is also established that the transition from the V to the fan phase is of first order, whereas the transition from the fan phase to the polarized paramagnetic phase is continuous. An analysis of the NMR spectra shows that the high-field fan phase of can be successfully described by a periodic commensurate oscillation of the magnetic moments around the field direction in each layer combined with an incommensurate modulation of the magnetic structure perpendicular to the layers.
8 More- Received 15 November 2021
- Accepted 10 January 2022
DOI:https://doi.org/10.1103/PhysRevB.105.014431
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