Ba-substitution induced evolution of structural and magnetic properties of La2-xBaxCoIrO6 double perovskites
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arXiv
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2025
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| author | Vieira, C. A. S. Santos, B. J. Duque, J. G. Bittar, E. M. Bufaiçal, L. |
| author_facet | Vieira, C. A. S. Santos, B. J. Duque, J. G. Bittar, E. M. Bufaiçal, L. |
| contents | The Iridium-based oxides are the subject of great recent interest due to the non-conventional physics that may emerge from the strong spin-orbit coupling present in 5d ions. Here, we explore the coupling between Ir and Co in the La2-xBaxCoIrO6 perovskites (x = 0, 0.5, 0.75 and 1.0), where the structural, electronic, and magnetic properties of the series are investigated by means of x-ray powder diffraction and magnetometry. The system's crystal structure evolves from the monoclinic P2_1/n to the triclinic I-1 space group as the Ba concentration increases. Measurements of magnetization revealed ferrimagnetic behavior in x = 0, 0.5 and 0.75 compounds, possibly resulting from antiferromagnetic coupling between Co2+/3+ and Ir4+. In contrast, for x = 1.0 a clear collinear antiferromagnetic character is observed for the Co2+ ions, resulting from the quenching of the Ir5+ magnetic moment. The evolution of the magnetic properties of the series is discussed in terms of the structural and electronic changes, as well as the spin-orbit coupling in Ir. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2511_12128 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Ba-substitution induced evolution of structural and magnetic properties of La2-xBaxCoIrO6 double perovskites Vieira, C. A. S. Santos, B. J. Duque, J. G. Bittar, E. M. Bufaiçal, L. Materials Science The Iridium-based oxides are the subject of great recent interest due to the non-conventional physics that may emerge from the strong spin-orbit coupling present in 5d ions. Here, we explore the coupling between Ir and Co in the La2-xBaxCoIrO6 perovskites (x = 0, 0.5, 0.75 and 1.0), where the structural, electronic, and magnetic properties of the series are investigated by means of x-ray powder diffraction and magnetometry. The system's crystal structure evolves from the monoclinic P2_1/n to the triclinic I-1 space group as the Ba concentration increases. Measurements of magnetization revealed ferrimagnetic behavior in x = 0, 0.5 and 0.75 compounds, possibly resulting from antiferromagnetic coupling between Co2+/3+ and Ir4+. In contrast, for x = 1.0 a clear collinear antiferromagnetic character is observed for the Co2+ ions, resulting from the quenching of the Ir5+ magnetic moment. The evolution of the magnetic properties of the series is discussed in terms of the structural and electronic changes, as well as the spin-orbit coupling in Ir. |
| title | Ba-substitution induced evolution of structural and magnetic properties of La2-xBaxCoIrO6 double perovskites |
| topic | Materials Science |
| url | https://arxiv.org/abs/2511.12128 |