Abstract
We present comprehensive electron spin resonance (ESR) studies of in-plane oriented single crystals of α-RuCl3, a quasi-two-dimensional material with honeycomb structure, focusing on its high-field spin dynamics. The measurements were performed in magnetic fields up to 16 T, applied along the [110] and [100] directions. Several ESR modes were detected. Combining our findings with recent inelastic neutron-and Raman-scattering data, we identified most of the observed excitations. Most importantly, we show that the low-temperature ESR response beyond the boundary of the magnetically ordered region is dominated by single-and two-particle processes with magnons as elementary excitations. The peculiarities of the excitation spectrum in the vicinity of the critical field are discussed.
| Original language | English |
|---|---|
| Article number | 037202 |
| Journal | Physical Review Letters |
| Volume | 125 |
| Issue number | 3 |
| DOIs | |
| State | Published - Jul 17 2020 |
Funding
This work was supported by the Deutsche Forschungsgemeinschaft through Grant No. ZV 6/2-2, the excellence cluster ct.qmat (EXC2147, Project-id No. 390858490), and SFB 1143, as well as by the HLD at HZDR, member of the European Magnetic Field Laboratory. A. B. and S. E. N. were supported by the Division of Scientific User Facilities, Basic Energy Sciences U.S. Department of Energy, P. L.-K. and D. G. M. by the Gordon and Betty Moore Foundation’s EPiQS Initiative through Grant No. GBMF4416, and J.-Q. Y. and C. A. B. by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division. We would like to thank D. Wulferdung and P. Lemmens for sharing their experimental data. We acknowledge discussions with M. Vojta, A. Chernyshev, M. Zhitomirsky, and A. Kolezhuk.