On the electronic ground state of two non-magnetic pentavalent honeycomb iridates
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arXiv
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| Auteurs principaux: | , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2022
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| _version_ | 1866918232401641472 |
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| author | de la Torre, A. Zager, B. Chamorro, J. R. Upton, M. H. Fabbris, G. Haskel, D. Casa, D. McQueen, T. M. Plumb, K. W. |
| author_facet | de la Torre, A. Zager, B. Chamorro, J. R. Upton, M. H. Fabbris, G. Haskel, D. Casa, D. McQueen, T. M. Plumb, K. W. |
| contents | We investigate the electronic structure of two Ir$^{5+}$ honeycomb iridates, Sr$_3$CaIr$_2$O$_9$ and NaIrO$_3$, by means of resonant x-ray techniques. We confirm that Sr$_3$CaIr$_2$O$_9$ realizes a large spin-orbit driven non-magnetic $J = 0$ singlet ground state despite sizable tetragonal distortions of Ir coordinating octahedra. On the other hand, the resonant inelastic x-ray spectra of NaIrO$_3$ are drastically different from expectations for a Mott insulator with octahedrally coordinated Ir$^{5+}$. We find that the data for NaIrO$_3$ can be best interpreted as originating from a narrow gap non-magnetic $S = 0$ band insulating ground state. Our results highlight the complex role of the ligand environment in the electronic structure of honeycomb iridates and the essential role of x-ray spectroscopy to characterize electronic ground states of insulating materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2206_11310 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | On the electronic ground state of two non-magnetic pentavalent honeycomb iridates de la Torre, A. Zager, B. Chamorro, J. R. Upton, M. H. Fabbris, G. Haskel, D. Casa, D. McQueen, T. M. Plumb, K. W. Strongly Correlated Electrons Materials Science We investigate the electronic structure of two Ir$^{5+}$ honeycomb iridates, Sr$_3$CaIr$_2$O$_9$ and NaIrO$_3$, by means of resonant x-ray techniques. We confirm that Sr$_3$CaIr$_2$O$_9$ realizes a large spin-orbit driven non-magnetic $J = 0$ singlet ground state despite sizable tetragonal distortions of Ir coordinating octahedra. On the other hand, the resonant inelastic x-ray spectra of NaIrO$_3$ are drastically different from expectations for a Mott insulator with octahedrally coordinated Ir$^{5+}$. We find that the data for NaIrO$_3$ can be best interpreted as originating from a narrow gap non-magnetic $S = 0$ band insulating ground state. Our results highlight the complex role of the ligand environment in the electronic structure of honeycomb iridates and the essential role of x-ray spectroscopy to characterize electronic ground states of insulating materials. |
| title | On the electronic ground state of two non-magnetic pentavalent honeycomb iridates |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2206.11310 |