Unconventional S-orbital state of Tb and cooperative Ru(4d)-Tb(4f) spin-ordering in strongly correlated 4d-4f system, Ba3TbRu2O9
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909646680227840 |
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| author | Kushwaha, E. Roy, G. Santos, A. M. dos Kumar, M. Ghosh, S. Heitmann, T. Basu, T. |
| author_facet | Kushwaha, E. Roy, G. Santos, A. M. dos Kumar, M. Ghosh, S. Heitmann, T. Basu, T. |
| contents | The 6H-perovskite Ba3RRu2O9 (R = rare-earth), composed of Ru2O9 dimers connected through RO6 octahedra, exhibits an intriguing variety of magnetic ground states, ranging from non-magnetic to ferromagnetic and antiferromagnetic, depending on the specific R ion. In this study, we investigate the compound Ba3TbRu2O9 using magnetic susceptibility measurements and time-of-flight neutron diffraction experiments. Our combined bulk and microscopic analyses reveal that the Tb4+ (4f7) electronic configuration results in an s-like state with an orbital moment L=0 and spin-only value of S=7/2, and Ru4+ exhibits a spin-only value of S=1 despite the presence of strong spin-lattice coupling in this compound, representing a sharp contrast to other reported members of this family. A cooperative 4d-4f spin ordering is observed below the Neel temperature (around 9.5 K), indicating strong Ru(4d)=Tb(4f) correlations in the system. The Tb-moments order antiferromagnetically in the bc-plane, whereas the Ru-moments are aligned antiferromagnetically along the b-axis. Furthermore, a collinear antiferromagnetic arrangement of spins is observed within the Ru2O9 dimers throughout the structure, unlike other reported members of this series (e.g., Ho and Nd). |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_07717 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Unconventional S-orbital state of Tb and cooperative Ru(4d)-Tb(4f) spin-ordering in strongly correlated 4d-4f system, Ba3TbRu2O9 Kushwaha, E. Roy, G. Santos, A. M. dos Kumar, M. Ghosh, S. Heitmann, T. Basu, T. Materials Science Strongly Correlated Electrons The 6H-perovskite Ba3RRu2O9 (R = rare-earth), composed of Ru2O9 dimers connected through RO6 octahedra, exhibits an intriguing variety of magnetic ground states, ranging from non-magnetic to ferromagnetic and antiferromagnetic, depending on the specific R ion. In this study, we investigate the compound Ba3TbRu2O9 using magnetic susceptibility measurements and time-of-flight neutron diffraction experiments. Our combined bulk and microscopic analyses reveal that the Tb4+ (4f7) electronic configuration results in an s-like state with an orbital moment L=0 and spin-only value of S=7/2, and Ru4+ exhibits a spin-only value of S=1 despite the presence of strong spin-lattice coupling in this compound, representing a sharp contrast to other reported members of this family. A cooperative 4d-4f spin ordering is observed below the Neel temperature (around 9.5 K), indicating strong Ru(4d)=Tb(4f) correlations in the system. The Tb-moments order antiferromagnetically in the bc-plane, whereas the Ru-moments are aligned antiferromagnetically along the b-axis. Furthermore, a collinear antiferromagnetic arrangement of spins is observed within the Ru2O9 dimers throughout the structure, unlike other reported members of this series (e.g., Ho and Nd). |
| title | Unconventional S-orbital state of Tb and cooperative Ru(4d)-Tb(4f) spin-ordering in strongly correlated 4d-4f system, Ba3TbRu2O9 |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2506.07717 |