Scale-invariant magnetic anisotropy in RuCl3 at high magnetic fields

Modic, K. A.; McDonald, Ross D.; Ruff, J. P. C.; Bachmann, Maja D.; Lai, You; Palmstrom, Johanna C.; Graf, David; Chan, Mun K.; Balakirev, F. F.; Betts, J. B.; Boebinger, G. S.; Schmidt, Marcus; Lawler, Michael J.; Sokolov, D. A.; Moll, Philip J. W.; Ramshaw, B. J.; Shekhter, Arkady

doi:10.1038/s41567-020-1028-0

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Scale-invariant magnetic anisotropy in RuCl₃ at high magnetic fields

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Modic, K. A.
Physics of Microstructured Quantum Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Bachmann, Maja D.
Physics of Microstructured Quantum Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Schmidt, Marcus
Marcus Schmidt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Sokolov, D. A.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Moll, Philip J. W.
Physics of Microstructured Quantum Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Modic, K. A., McDonald, R. D., Ruff, J. P. C., Bachmann, M. D., Lai, Y., Palmstrom, J. C., et al. (2021). Scale-invariant magnetic anisotropy in RuCl₃ at high magnetic fields. Nature Physics, 17, 240-244. doi:10.1038/s41567-020-1028-0.

Cite as: https://hdl.handle.net/21.11116/0000-0007-5C7B-9

Abstract

Scale-invariant magnetic anisotropy in RuCl(3)has been revealed through measurements of its magnetotropic coefficient, providing evidence for a high degree of exchange frustration that favours the formation of a spin liquid state.
In RuCl3, inelastic neutron scattering and Raman spectroscopy reveal a continuum of non-spin-wave excitations that persists to high temperature, suggesting the presence of a spin liquid state on a honeycomb lattice. In the context of the Kitaev model, finite magnetic fields introduce interactions between the elementary excitations, and thus the effects of high magnetic fields that are comparable to the spin-exchange energy scale must be explored. Here, we report measurements of the magnetotropic coefficient-the thermodynamic coefficient associated with magnetic anisotropy-over a wide range of magnetic fields and temperatures. We find that magnetic field and temperature compete to determine the magnetic response in a way that is independent of the large intrinsic exchange-interaction energy. This emergent scale-invariant magnetic anisotropy provides evidence for a high degree of exchange frustration that favours the formation of a spin liquid state in RuCl3.