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      Probing \(\alpha -{\mathrm{RuCl}}_{3}\) Beyond Magnetic Order: Effects of Temperature and Magnetic Field

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          Abstract

          Recent studies have brought α-RuCl_{3} to the forefront of experimental searches for materials realizing Kitaev spin-liquid physics. This material exhibits strongly anisotropic exchange interactions afforded by the spin-orbit coupling of the 4d Ru centers. We investigate the dynamical response at finite temperature and magnetic field for a realistic model of the magnetic interactions in α-RuCl_{3}. These regimes are thought to host unconventional paramagnetic states that emerge from the suppression of magnetic order. Using exact diagonalization calculations of the quantum model complemented by semiclassical analysis, we find a very rich evolution of the spin dynamics as the applied field suppresses the zigzag order and stabilizes a quantum paramagnetic state that is adiabatically connected to the fully polarized state at high fields. At finite temperature, we observe large redistributions of spectral weight that can be attributed to the anisotropic frustration of the model. These results are compared to recent experiments and provide a road map for further studies of these regimes.

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          Author and article information

          Journal
          PRLTAO
          Physical Review Letters
          Phys. Rev. Lett.
          American Physical Society (APS)
          0031-9007
          1079-7114
          February 2018
          February 15 2018
          : 120
          : 7
          Article
          10.1103/PhysRevLett.120.077203
          29542970
          25c52645-a3aa-442d-b393-fd4afaab066c
          © 2018

          https://link.aps.org/licenses/aps-default-license

          https://link.aps.org/licenses/aps-default-accepted-manuscript-license

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