Abstract
Magnetic excitons and spin-orbit transitions are investigated in the pseudospin-12CoTiO3 Dirac magnon system using inelastic neutron scattering. The magnon density of states consists of two magnon peaks with a gapless Dirac node nestled between them. Above 38 K, the Néel temperature (TN), the magnon modes are renormalized to lower energies. Magnetic excitations attributed to spin-orbit exciton multiplet transitions follow the same temperature dependence as the magnons, with the intensity dissipating quickly above TN. On the other hand, energy level transitions arising from the crystal field and spin-orbit coupling (with an estimated λ≈14meV) are gradually thermally populated, continuing through TN and reaching a maximum at ∼100K. The excitations significantly broaden but persist through room temperature.
| Original language | English |
|---|---|
| Article number | 174432 |
| Journal | Physical Review B |
| Volume | 109 |
| Issue number | 17 |
| DOIs | |
| State | Published - May 1 2024 |
Funding
The authors would like to acknowledge discussions with Arun Paramekanti. The work at the University of Virginia is supported by the Department of Energy, Grant No. DE-FG02-01ER45927. The Spallation Neutron Source is a DOE Office of Science User Facility operated by Oak Ridge National Laboratory.