Spin-orbital-lattice entanglement in the ideal j=1/2 compound K$_2$IrCl$_6$
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866913686339190784 |
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| author | Warzanowski, P. Magnaterra, M. Sahle, Ch. J. Sala, M. Moretti Becker, P. Bohatý, L. Císařová, I. Monaco, G. Lorenz, T. van Loosdrecht, P. H. M. Brink, J. van den Grüninger, M. |
| author_facet | Warzanowski, P. Magnaterra, M. Sahle, Ch. J. Sala, M. Moretti Becker, P. Bohatý, L. Císařová, I. Monaco, G. Lorenz, T. van Loosdrecht, P. H. M. Brink, J. van den Grüninger, M. |
| contents | Mott insulators with spin-orbit entangled j=1/2 moments host intriguing magnetic properties. The j=1/2 wave function requires cubic symmetry, while a noncubic crystal field mixes j=1/2 and 3/2 character. Spectroscopic studies of $5d^5$ iridates typically claim noncubic symmetry, e.g., based on a splitting of the excited j=3/2 quartet. A sizable splitting is particularly puzzling in antifluorite-type K$_2$IrCl$_6$, a frustrated fcc quantum magnet with global cubic symmetry. It raises the fundamental question about the stability of j=1/2 moments against magneto-elastic coupling. Combining resonant inelastic x-ray scattering with optical spectroscopy, we demonstrate that the multi-peak line shape in K$_2$IrCl$_6$ reflects a vibronic character of the j=3/2 states rather than a noncubic crystal field. The quasimolecular crystal structure with well separated IrCl$_6$ octahedra explains the existence of well-defined sidebands that are usually smeared out in solids. Our results highlight the spin-orbital-lattice entangled character of cubic K$_2$IrCl$_6$ with ideal j=1/2 moments. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2407_12133 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Spin-orbital-lattice entanglement in the ideal j=1/2 compound K$_2$IrCl$_6$ Warzanowski, P. Magnaterra, M. Sahle, Ch. J. Sala, M. Moretti Becker, P. Bohatý, L. Císařová, I. Monaco, G. Lorenz, T. van Loosdrecht, P. H. M. Brink, J. van den Grüninger, M. Strongly Correlated Electrons Mott insulators with spin-orbit entangled j=1/2 moments host intriguing magnetic properties. The j=1/2 wave function requires cubic symmetry, while a noncubic crystal field mixes j=1/2 and 3/2 character. Spectroscopic studies of $5d^5$ iridates typically claim noncubic symmetry, e.g., based on a splitting of the excited j=3/2 quartet. A sizable splitting is particularly puzzling in antifluorite-type K$_2$IrCl$_6$, a frustrated fcc quantum magnet with global cubic symmetry. It raises the fundamental question about the stability of j=1/2 moments against magneto-elastic coupling. Combining resonant inelastic x-ray scattering with optical spectroscopy, we demonstrate that the multi-peak line shape in K$_2$IrCl$_6$ reflects a vibronic character of the j=3/2 states rather than a noncubic crystal field. The quasimolecular crystal structure with well separated IrCl$_6$ octahedra explains the existence of well-defined sidebands that are usually smeared out in solids. Our results highlight the spin-orbital-lattice entangled character of cubic K$_2$IrCl$_6$ with ideal j=1/2 moments. |
| title | Spin-orbital-lattice entanglement in the ideal j=1/2 compound K$_2$IrCl$_6$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2407.12133 |