Abstract
We study the magnetic order and excitations in strong spin-orbit-coupled, Van Vleck–type, Mott insulators on a square lattice. Extending the previous work, we include the tetragonal crystal-field splitting and explore its effects on the magnetic phase diagram and magnon spectra. Two different ordered phases, with in-plane and out-of-plane orientations of the staggered moments, are found for the higher and lower values of the crystal-field splitting, respectively. The magnetic excitation spectra for paramagnetic and magnetically ordered phases are calculated and discussed in the context of a candidate spin-orbit Mott insulator, .
- Received 16 May 2014
- Revised 15 July 2014
DOI:https://doi.org/10.1103/PhysRevB.90.035137
©2014 American Physical Society