| Autor: |
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., Grüninger, M., Winter, S. M., Wang, Z., Valentí, R., Loosdrecht, P. H. M. |
| Jazyk: |
angličtina |
| Rok vydání: |
2020 |
| Zdroj: |
Physical Review B 101(2020), 140410 |
| Popis: |
Layered α−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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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