%0 Journal Article %1 PhysRevLett.125.037202 %A Ponomaryov, A. N. %A Zviagina, L. %A Wosnitza, J. %A Lampen-Kelley, P. %A Banerjee, A. %A Yan, J.-Q. %A Bridges, C. A. %A Mandrus, D. G. %A Nagler, S. E. %A Zvyagin, S. A. %D 2020 %I American Physical Society %J Phys. Rev. Lett. %K b %N 3 %P 037202 %R 10.1103/PhysRevLett.125.037202 %T Nature of magnetic excitations in the high-field phase of α-RuCl$_3$ %U https://link.aps.org/doi/10.1103/PhysRevLett.125.037202 %V 125 %X 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.

@article{PhysRevLett.125.037202, 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.}, added-at = {2020-08-19T10:58:01.000+0200}, author = {Ponomaryov, A. N. and Zviagina, L. and Wosnitza, J. and Lampen-Kelley, P. and Banerjee, A. and Yan, J.-Q. and Bridges, C. A. and Mandrus, D. G. and Nagler, S. E. and Zvyagin, S. A.}, biburl = {https://www.bibsonomy.org/bibtex/2feedb7ce2b8e233a9c009dede207e595/ctqmat}, day = 14, description = {Phys. Rev. Lett. 125, 037202 (2020) - Nature of Magnetic Excitations in the High-Field Phase of $\ensuremath{\alpha}\text{\ensuremath{-}}{\mathrm{RuCl}}_{3}$}, doi = {10.1103/PhysRevLett.125.037202}, interhash = {bd6c4a9dfa064eacdeb99fc3824d1972}, intrahash = {feedb7ce2b8e233a9c009dede207e595}, journal = {Phys. Rev. Lett.}, keywords = {b}, month = {07}, number = 3, numpages = {6}, pages = 037202, publisher = {American Physical Society}, timestamp = {2023-10-20T08:06:43.000+0200}, title = {Nature of magnetic excitations in the high-field phase of α-RuCl$_{\mathbf{3}}$}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.125.037202}, volume = 125, year = 2020 }