Diffusive excitonic bands from frustrated triangular sublattice in a singlet-ground-state system.

ABSTRACT: Magnetic order in most materials occurs when magnetic ions with finite moments arrange in a particular pattern below the ordering temperature. Intriguingly, if the crystal electric field (CEF) effect results in a spin-singlet ground state, a magnetic order can still occur due to the exchange interactions between neighboring ions admixing the excited CEF levels. The magnetic excitations in such a state are spin excitons generally dispersionless in reciprocal space. Here we use neutron scattering to study stoichiometric Ni₂Mo₃O₈, where Ni²⁺ ions form a bipartite honeycomb lattice comprised of two triangular lattices, with ions subject to the tetrahedral and octahedral crystalline environment, respectively. We find that in both types of ions, the CE

SUBMITTER: Gao B 

PROVIDER: S-EPMC10097669 | biostudies-literature | 2023 Apr

REPOSITORIES: biostudies-literature