Abstract
We performed inelastic neutron scattering experiments on single-crystal samples of the honeycomb lattice magnet, ilmenite NiTiO3. Below the Néel temperature of 22K, spin wave excitations with a band energy of 3.7meV were observed. The neutron energy spectra were well-reproduced by modeling the system as a ferromagnetic honeycomb lattice with antiferromagnetic interlayer coupling, using linear spin wave theory. Similar to another ilmenite CoTiO3, a crossing structure was observed at the K point, suggesting the presence of Dirac magnons in NiTiO3. Further calculations suggested the formation of Dirac nodal line.
| Original language | English |
|---|---|
| Article number | 024703 |
| Journal | Journal of the Physical Society of Japan |
| Volume | 94 |
| Issue number | 2 |
| DOIs | |
| State | Published - Feb 15 2025 |
Funding
We are grateful to D. Kawana, T. Asami, and R. Sugiura for supporting us in the neutron scattering experiment at HODACA. The neutron experiment using HODACA at JRR-3 was carried out by the joint research in the Institute for Solid State Physics, the University of Tokyo (Proposal 23545). The beam time was allocated to CTAX on proposal number IPTS-30490.1. A portion of this research used resources at the High Flux Isotope Reactor, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory (ORNL). Travel expenses for the neutron scattering experiments performed using CTAX at ORNL, U.S.A. was supported by the U.S.\u2013Japan Cooperative Research Program on Neutron Scattering. This project was supported by JSPS KAKENHI Grant No. 21H04441.