Wang, L.; Liu, H.; Zimmermann, V.; Yogi, A. K.; Isobe, M.; Minola, M.; Hepting, M.; Khaliullin, G.; Keimer, B. Spin-Orbit Excitons in a Correlated Metal: Raman Scattering Study of Sr2RhO4 Journal Article Phys. Rev. Lett. 132, 116502, 2024. @article{wang_spin-orbit_2024,
title = {Spin-Orbit Excitons in a Correlated Metal: Raman Scattering Study of Sr_{2}RhO_{4}},
author = {L. Wang and H. Liu and V. Zimmermann and A. K. Yogi and M. Isobe and M. Minola and M. Hepting and G. Khaliullin and B. Keimer},
doi = {10.1103/PhysRevLett.132.116502},
year = {2024},
date = {2024-03-01},
urldate = {2024-03-01},
journal = {Phys. Rev. Lett.},
volume = {132},
number = {11},
pages = {116502},
abstract = {Using Raman spectroscopy to study the correlated 4d-electron metal Sr2RhO4, we observe pronounced excitations at 220 meV and 240 meV with A1g and B1g 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 Sr2IrO4 and α−RuCl3. This observation provides direct evidence for the unquenched spin-orbit coupling in Sr2RhO4. A quantitative analysis of the data reveals that the tetragonal crystal field Δ in Sr2RhO4 has a sign opposite to that in insulating Sr2IrO4, 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 Sr2RhO4 may transform it into a quasi-two-dimensional antiferromagnetic insulator.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Using Raman spectroscopy to study the correlated 4d-electron metal Sr2RhO4, we observe pronounced excitations at 220 meV and 240 meV with A1g and B1g 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 Sr2IrO4 and α−RuCl3. This observation provides direct evidence for the unquenched spin-orbit coupling in Sr2RhO4. A quantitative analysis of the data reveals that the tetragonal crystal field Δ in Sr2RhO4 has a sign opposite to that in insulating Sr2IrO4, 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 Sr2RhO4 may transform it into a quasi-two-dimensional antiferromagnetic insulator. |  |
