Spin-orbit entangled pseudospins give rise to exotic types of magnetism not found in conventional magnets. For example, the pseudospin pairs on different bonds of a honeycomb lattice tend to align along mutually orthogonal directions, leading to strong frustration and Kitaev quantum spin liquid state. This peculiar behavior of pseudospins stems from the way they interact with each other, but how pseudospins interact with the lattice remains largely unexplored. In pair of papers, we present a new theoretical description of the pseudospin-lattice coupling as well as experimental evidence that this coupling plays a decisive role in determining the macroscopic magnetization and low-energy dynamics of Sr2
, an archetypal spin-orbit Mott insulator.
"Pseudo-Jahn-Teller Effect and Magnetoelastic Coupling in Spin-Orbit Mott Insulators"
H. Liu and G. Khaliullin, Phys. Rev. Lett. 122, 057203 (2019)
"Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr2
J. Porras et al., Phys. Rev. B 99, 085125 (2019) more