Abstract
We have found an unusual competition of two frustration mechanisms in the 2D quantum antiferromagnet . The key actors are the alternation of single-ion planar anisotropy direction of the individual magnetic ions, and their arrangement in a distorted triangular lattice structure. In particular, the uniquely oriented Ising-type anisotropy emerges from the competition of easy-plane ones, and for a magnetic field applied along this axis one finds a cascade of five ordered phases at low temperatures. Two of these phases feature magnetization plateaux. The low-field one is supposed to be a consequence of a collinear ground state stabilized by the anisotropy, while the other plateau bears characteristics of an “up-up-down” state exclusive for lattices with triangular exchange patterns. Such coexistence of the magnetization plateaux is a fingerprint of competition between the anisotropy and the geometric frustration in .
1 More- Received 21 April 2020
- Revised 18 November 2020
- Accepted 20 November 2020
DOI:https://doi.org/10.1103/PhysRevResearch.2.043384
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Published by the American Physical Society