Resonant Inelastic X-ray Scattering Study of Ca$_3$Ru$_2$O$_7$
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| Main Authors: | , , , , , , , , , , , , , , , |
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2020
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| author | von Arx, K. Forte, F. Horio, M. Granata, V. Wang, Q. Das, L. Sassa, Y. Fittipaldi, R. Fatuzzo, C. G. Ivashko, O. Tseng, Y. Paris, E. Vecchione, A. Schmitt, T. Cuoco, M. Chang, J. |
| author_facet | von Arx, K. Forte, F. Horio, M. Granata, V. Wang, Q. Das, L. Sassa, Y. Fittipaldi, R. Fatuzzo, C. G. Ivashko, O. Tseng, Y. Paris, E. Vecchione, A. Schmitt, T. Cuoco, M. Chang, J. |
| contents | We present a combined oxygen $K$-edge x-ray absorption spectroscopy (XAS) and resonant inelastic x-ray scattering (RIXS) study of the bilayer ruthenate Ca$_3$Ru$_2$O$_7$. Our RIXS experiments on Ca$_3$Ru$_2$O$_7$ were carried out on the overlapping planar and inter-planar oxygen resonances, which are distinguishable from the apical one. Comparison to equivalent oxygen $K$-edge spectra recorded on band-Mott insulating Ca$_2$RuO$_4$ is made. In contrast to Ca$_2$RuO$_4$ spectra, which contain excitations linked to Mott physics, Ca$_3$Ru$_2$O$_7$ spectra feature only intra-$t_{2g}$ ones that do not directly involve the Coulomb energy scale. As found in Ca$_2$RuO$_4$, we resolve two intra-$t_{2g}$ excitations in Ca$_3$Ru$_2$O$_7$. Moreover, the lowest lying excitation in Ca$_3$Ru$_2$O$_7$ shows a significant dispersion, revealing a collective character differently from what is observed in Ca$_2$RuO$_4$. Theoretical modelling supports the interpretation of this lowest energy excitation in Ca$_3$Ru$_2$O$_7$ as a magnetic transverse mode with multi-particle character, whereas the corresponding excitation in Ca$_2$RuO$_4$ is assigned to combined longitudinal and transverse spin modes. These fundamental differences are discussed in terms of the inequivalent magnetic ground-state manifestations in Ca$_2$RuO$_4$ and Ca$_3$Ru$_2$O$_7$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2004_13391 |
| institution | arXiv |
| publishDate | 2020 |
| record_format | arxiv |
| spellingShingle | Resonant Inelastic X-ray Scattering Study of Ca$_3$Ru$_2$O$_7$ von Arx, K. Forte, F. Horio, M. Granata, V. Wang, Q. Das, L. Sassa, Y. Fittipaldi, R. Fatuzzo, C. G. Ivashko, O. Tseng, Y. Paris, E. Vecchione, A. Schmitt, T. Cuoco, M. Chang, J. Strongly Correlated Electrons We present a combined oxygen $K$-edge x-ray absorption spectroscopy (XAS) and resonant inelastic x-ray scattering (RIXS) study of the bilayer ruthenate Ca$_3$Ru$_2$O$_7$. Our RIXS experiments on Ca$_3$Ru$_2$O$_7$ were carried out on the overlapping planar and inter-planar oxygen resonances, which are distinguishable from the apical one. Comparison to equivalent oxygen $K$-edge spectra recorded on band-Mott insulating Ca$_2$RuO$_4$ is made. In contrast to Ca$_2$RuO$_4$ spectra, which contain excitations linked to Mott physics, Ca$_3$Ru$_2$O$_7$ spectra feature only intra-$t_{2g}$ ones that do not directly involve the Coulomb energy scale. As found in Ca$_2$RuO$_4$, we resolve two intra-$t_{2g}$ excitations in Ca$_3$Ru$_2$O$_7$. Moreover, the lowest lying excitation in Ca$_3$Ru$_2$O$_7$ shows a significant dispersion, revealing a collective character differently from what is observed in Ca$_2$RuO$_4$. Theoretical modelling supports the interpretation of this lowest energy excitation in Ca$_3$Ru$_2$O$_7$ as a magnetic transverse mode with multi-particle character, whereas the corresponding excitation in Ca$_2$RuO$_4$ is assigned to combined longitudinal and transverse spin modes. These fundamental differences are discussed in terms of the inequivalent magnetic ground-state manifestations in Ca$_2$RuO$_4$ and Ca$_3$Ru$_2$O$_7$. |
| title | Resonant Inelastic X-ray Scattering Study of Ca$_3$Ru$_2$O$_7$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2004.13391 |