Spectroscopic investigations on trivalent ruthenium ions in ruthenium perovskite oxide thin films
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arXiv
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2024
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| _version_ | 1866913253004673024 |
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| author | Nakata, S. Takahashi, R. Matsumoto, R. Zhang, L. -F. Sumida, H. Suzuki, S. Fujita, T. C. Kawasaki, M. Wadati, H. |
| author_facet | Nakata, S. Takahashi, R. Matsumoto, R. Zhang, L. -F. Sumida, H. Suzuki, S. Fujita, T. C. Kawasaki, M. Wadati, H. |
| contents | The $d^5$ electron configurations under the crystal field, spin-orbit coupling, and Coulomb interaction give rise to a plethora of profound ground states. Ruthenium perovskite oxides exhibit a number of unconventional properties yet the Ru$^{4+}$ state ($4d^4$) is usually stable in these materials. In this regard, Ru$^{3+}$ ions in perovskite materials are expected to be a mesmerising playground of $4d^5$ electron configurations. Here, we report measurements of x-ray photoemission spectroscopy on recently synthesized perovskite ruthenium oxide thin films, LaRuO$_3$ and NdRuO$_3$, whose valence state of the ruthenium ions is trivalent. We discuss correlation and spin-orbit effects from the valence-band spectra, in particular an additional peak structure around 3-5 eV, reminiscent of the so-called 3 eV peak observed in Sr$_2$RuO$_4$. Moreover, we find that the core-level spectra of these materials are quantitatively different from those in other ruthenates which possess Ru$^{4+}$ ions, e.g., SrRuO$_3$. We therefore argue that the core level spectra of LaRuO$_3$ and NdRuO$_3$ are peculiar to the Ru$^{3+}$ states. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2403_01853 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Spectroscopic investigations on trivalent ruthenium ions in ruthenium perovskite oxide thin films Nakata, S. Takahashi, R. Matsumoto, R. Zhang, L. -F. Sumida, H. Suzuki, S. Fujita, T. C. Kawasaki, M. Wadati, H. Materials Science Strongly Correlated Electrons The $d^5$ electron configurations under the crystal field, spin-orbit coupling, and Coulomb interaction give rise to a plethora of profound ground states. Ruthenium perovskite oxides exhibit a number of unconventional properties yet the Ru$^{4+}$ state ($4d^4$) is usually stable in these materials. In this regard, Ru$^{3+}$ ions in perovskite materials are expected to be a mesmerising playground of $4d^5$ electron configurations. Here, we report measurements of x-ray photoemission spectroscopy on recently synthesized perovskite ruthenium oxide thin films, LaRuO$_3$ and NdRuO$_3$, whose valence state of the ruthenium ions is trivalent. We discuss correlation and spin-orbit effects from the valence-band spectra, in particular an additional peak structure around 3-5 eV, reminiscent of the so-called 3 eV peak observed in Sr$_2$RuO$_4$. Moreover, we find that the core-level spectra of these materials are quantitatively different from those in other ruthenates which possess Ru$^{4+}$ ions, e.g., SrRuO$_3$. We therefore argue that the core level spectra of LaRuO$_3$ and NdRuO$_3$ are peculiar to the Ru$^{3+}$ states. |
| title | Spectroscopic investigations on trivalent ruthenium ions in ruthenium perovskite oxide thin films |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2403.01853 |