Researchers from The University of Osaka stabilize an exotic cobalt-based honeycomb structure that could help advance low-cost quantum technologies Osaka, Japan – Honeycombs are famous for their elegant design, but now they may have found a new application: quantum computing. To collect knowledge from subatomic particles, quantum computers require carefully designed materials capable of performing necessary, complex functions. However, the metals used, such as ruthenium and iridium, are often rare and expensive, limiting the potential to build new technology. In an article recently published in Physical Review Materials, researchers from SANKEN at The University of Osaka and collaborating institutions reported the creation of a special thin-film material in which cobalt atoms formed local honeycomb arrangements embedded inside a larger honeycomb matrix. These cobalt honeycomb motifs exhibit strong magnetic interactions, which are important for quantum computing applications. Kitaev materials, a class of quantum magnetic materials studied for their potential use in quantum information science, have attracted major attention because they may host exotic quantum states known as spin liquids. In spin liquids, unlike typical liquid matter, the arrangement of spin can stay fluid even when the temperature drops. This is because the needle-like spins constantly flip as they are unable to satisfy all the forces influencing them. One approach to form these liquids involves using a honeycomb-shaped crystal lattice, in which strong interactions between neighboring magnetic ions can be competing intensely. “Previous work in this area has largely been limited to rare metals like ruthenium and iridium,” says lead author Hao-Bo Li. “We asked whether cobalt, one of the most common transition metals on Earth, could be made to form the same honeycomb structure and display the same intriguing physics.” The team created their material by adding about 4% cobalt into sodium antimonate (NaSbO3), a compound that already possesses a layered