Bibliographic Details
| Title: |
Formation of orbital molecules on a pyrochlore lattice induced by A-O bond covalency |
| Authors: |
Krajewska, A., Yaresko, A., Nuss, J., Gibbs, A. S., Bette, S., Blankenhorn, M., Dinnebier, R. E., Sari, D. P., Watanabe, I., Bertinshaw, J., Gretarsson, H., Ishii, K., Matsumura, D., Tsuji, T., Isobe, M., Keimer, B., Takagi, H., Takayama, T. |
| Publication Year: |
2021 |
| Collection: |
Condensed Matter |
| Subject Terms: |
Condensed Matter - Strongly Correlated Electrons |
| More Details: |
The pyrochlore ruthenate In$_2$Ru$_2$O$_7$ displays a subtle competition between spin-orbital entanglement and molecular orbital formation. At room temperature, a spin-orbit-entangled singlet state was identified. With decreasing temperature, In$_2$Ru$_2$O$_7$ undergoes multiple structural transitions and eventually forms a nonmagnetic ground state with semi-isolated Ru$_2$O units on the pyrochlore lattice. The dominant hopping through the Ru-O-Ru linkage leads to molecular orbital formation within the Ru$_2$O units. This molecular orbital formation is unique in that it involves the O$^{2-}$ anions, unlike the transition-metal dimers observed in systems with edge-sharing octahedra. We argue that the covalent character of In-O bonds plays a pivotal role in the structural transitions and molecular orbital formation and such bonding character of "$A$-site" ions is an important ingredient for electronic phase competition in complex transition metal oxides. |
| Document Type: |
Working Paper |
| Access URL: |
http://arxiv.org/abs/2111.05057 |
| Accession Number: |
edsarx.2111.05057 |
| Database: |
arXiv |
