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SM ISO690:2012 SAHASRABUDHE, Anuja, NOI, Autori, TSURKAN, Vladimir. High-field quantum disordered state in α-RuCl3: Spin flips, bound states, and multiparticle continuum. In: Physical Review B, 2020, vol. 101, p. 0. ISSN 2469-9950. DOI: https://doi.org/10.1103/PhysRevB.101.140410 |
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Physical Review B | ||||||
Volumul 101 / 2020 / ISSN 2469-9950 /ISSNe 2469-9969 | ||||||
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DOI:https://doi.org/10.1103/PhysRevB.101.140410 | ||||||
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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. |
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Cuvinte-cheie excited states, Phase transitions, temperature, Terahertz spectroscopy |
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