Abstract
We report transport and inelastic neutron scattering studies on electronic properties and spin dynamics of the quasi-one-dimensional spin-chain antiferromagnet RbFeS2. An antiferromagnetic phase transition at TN≈195 K and dispersive spin waves with a spin gap of 5 meV are observed. By modeling the spin excitation spectra using linear spin wave theory, intra and interchain exchange interactions are found to be SJ1=100(5) meV and SJ3=0.9(3) meV, respectively, together with a small single-ion anisotropy of SDzz=0.04(1) meV. Comparison with previous results for other materials in the same class of Fe3+ spin-chain systems reveals that although the magnetic order sizes show significant variation from 1.8 to 3.0μB within the family of materials, the exchange interactions SJ are nevertheless quite similar, analogous to the iron pnictide superconductors where both localized and delocalized electrons contribute to the spin dynamics.
| Original language | English |
|---|---|
| Article number | 224419 |
| Journal | Physical Review B |
| Volume | 104 |
| Issue number | 22 |
| DOIs | |
| State | Published - Dec 1 2021 |
Funding
M.W. was supported by the National Natural Science Foundation of China (Grants No. 11904414 and No. 12174454), National Key Research and Development Program of China (No. 2019YFA0705702). D.X.Y. was supported by NKRDPC-2018YFA0306001, NKRDPC-2017YFA0206203, NSFC-11974432, GBABRF-2019A1515011337, and Leading Talent Program of Guangdong Special Projects. Work at University of California, Berkeley and Lawrence Berkeley National Laboratory was funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division under Contract No. DE-AC02-05-CH11231 within the Quantum Materials Program (KC2202) and the Office of Basic Energy Sciences. The experiment at Oak Ridge National Laboratory's Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy.