Spin-orbit excitons in a correlated metal: Raman scattering study of Sr2RhO4
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866929281779630080 |
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| author | Wang, Lichen Liu, Huimei Zimmermann, Valentin Yogi, Arvind Kumar Isobe, Masahiko Minola, Matteo Hepting, Matthias Khaliullin, Giniyat Keimer, Bernhard |
| author_facet | Wang, Lichen Liu, Huimei Zimmermann, Valentin Yogi, Arvind Kumar Isobe, Masahiko Minola, Matteo Hepting, Matthias Khaliullin, Giniyat Keimer, Bernhard |
| contents | Using Raman spectroscopy to study the correlated 4$d$-electron metal Sr$_2$RhO$_4$, we observe pronounced excitations at 220 meV and 240 meV with $A_\mathrm{1g}$ and $B_\mathrm{1g}$ symmetries, respectively. We identify them as transitions between the spin-orbit multiplets of the Rh ions, in close analogy to the spin-orbit excitons in the Mott insulators Sr$_2$IrO$_4$ and $α$-RuCl$_3$. This observation provides direct evidence for the unquenched spin-orbit coupling in Sr$_2$RhO$_4$. A quantitative analysis of the data reveals that the tetragonal crystal field $Δ$ in Sr$_2$RhO$_4$ has a sign opposite to that in insulating Sr$_2$IrO$_4$, which enhances the planar $xy$ orbital character of the effective $J=1/2$ wave function. This supports a metallic ground state, and suggests that $c$-axis compression of Sr$_2$RhO$_4$ may transform it into a quasi-two-dimensional antiferromagnetic insulator. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2309_15299 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Spin-orbit excitons in a correlated metal: Raman scattering study of Sr2RhO4 Wang, Lichen Liu, Huimei Zimmermann, Valentin Yogi, Arvind Kumar Isobe, Masahiko Minola, Matteo Hepting, Matthias Khaliullin, Giniyat Keimer, Bernhard Strongly Correlated Electrons Using Raman spectroscopy to study the correlated 4$d$-electron metal Sr$_2$RhO$_4$, we observe pronounced excitations at 220 meV and 240 meV with $A_\mathrm{1g}$ and $B_\mathrm{1g}$ symmetries, respectively. We identify them as transitions between the spin-orbit multiplets of the Rh ions, in close analogy to the spin-orbit excitons in the Mott insulators Sr$_2$IrO$_4$ and $α$-RuCl$_3$. This observation provides direct evidence for the unquenched spin-orbit coupling in Sr$_2$RhO$_4$. A quantitative analysis of the data reveals that the tetragonal crystal field $Δ$ in Sr$_2$RhO$_4$ has a sign opposite to that in insulating Sr$_2$IrO$_4$, which enhances the planar $xy$ orbital character of the effective $J=1/2$ wave function. This supports a metallic ground state, and suggests that $c$-axis compression of Sr$_2$RhO$_4$ may transform it into a quasi-two-dimensional antiferromagnetic insulator. |
| title | Spin-orbit excitons in a correlated metal: Raman scattering study of Sr2RhO4 |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2309.15299 |