High-field quantum disordered state in alpha-RuCl3: Spin flips, bound states, and multiparticle continuum
- Authors
- Sahasrabudhe, A.; Kaib, D. A. S.; Reschke, S.; German, R.; Koethe, T. C.; Buhot, J.; Kamenskyi, D.; Hickey, C.; Becker, P.; Tsurkan, V; Loidl, A.; Do, S. H.; Choi, K. Y.; Grueninger, M.; Winter, S. M.; Wang, Zhe; Valenti, R.; van Loosdrecht, P. H. M.
- Issue Date
- 24-Apr-2020
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW B, v.101, no.14
- Journal Title
- PHYSICAL REVIEW B
- Volume
- 101
- Number
- 14
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/41916
- DOI
- 10.1103/PhysRevB.101.140410
- ISSN
- 2469-9950
2469-9969
- Abstract
- Layered alpha-RuCl3 has been discussed as a proximate Kitaev spin-liquid compound. Raman and terahertz spectroscopy of magnetic excitations confirms that the low-temperature antiferromagnetic ordered phase features a broad Raman continuum, together with two magnonlike excitations at 2.7 and 3.6 meV, respectively. The continuum strength is maximized as long-range order is suppressed by an external magnetic field. The state above the field-induced quantum phase transition around 7.5 T is characterized by a gapped multiparticle continuum out of which a two-particle bound state emerges, together with a well-defined single-particle excitation at lower energy. Exact diagonalization calculations demonstrate that Kitaev and off-diagonal exchange terms in the Fleury-Loudon operator give rise to a pronounced intensity of these features in the Raman spectra. Our Rapid Communication firmly establishes the partially polarized quantum disordered character of the high-field phase.
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