Thursday 20 March 2025
Researchers have discovered a new class of two-dimensional materials that exhibit both superconductivity and magnetic ordering, potentially paving the way for the development of more efficient energy storage and transmission systems.
The team, led by Tommy Li, has created a series of compounds called AC8XC8, which consist of two layers of graphene, a chalcogen (such as oxygen or sulfur) intercalation layer, and an alkaline earth adlayer. The unique structure of these materials allows for the formation of complex Fermi surfaces featuring electron and hole pockets whose densities exactly compensate each other.
Using density functional theory, the researchers studied the electronic band structure of the 20 compounds in the AC8XC8 series. They found that the chalcogen p orbitals interact with the carbon π orbitals to form weakly dispersing bands that give rise to van Hove singularities very close to or coincident with the Fermi level in most cases.
The resulting electron-electron interaction effects were studied using both the temperature-flow renormalization group approach and a spin fluctuation model. These calculations revealed a dominant ferromagnetic instability coexisting with p- or f-wave spin triplet superconductivity over a range of temperatures.
One of the key findings is that the magnetic ordering in these materials is ferromagnetic, meaning it aligns all the spins in the same direction. This is unusual compared to other superconducting materials, where the magnetic ordering is often antiferromagnetic or non-magnetic.
The researchers also found that the separation between the ferromagnetic critical temperature and the superconducting transition temperature is quite small, suggesting that the two phenomena may be closely linked. This could potentially lead to new ways of manipulating and controlling the properties of these materials.
The AC8XC8 compounds are not yet ready for practical application, but they offer a promising new direction in the search for more efficient energy storage and transmission technologies. Further research is needed to fully understand the properties of these materials and to develop methods for large-scale production.
In addition to their potential applications in energy technology, these materials may also have implications for our understanding of superconductivity itself. The ferromagnetic ordering in AC8XC8 challenges current theories of superconductivity, which typically assume antiferromagnetic or non-magnetic behavior. This could lead to a deeper understanding of the underlying physics that governs superconducting phenomena.
Cite this article: “Discovery of Ferromagnetic Superconductors with Potential for Energy Storage and Transmission Advancements”, The Science Archive, 2025.
Superconductivity, Magnetic Ordering, Two-Dimensional Materials, Graphene, Chalcogen, Alkaline Earth, Electron-Electron Interaction, Ferromagnetism, Spin Fluctuation Model, Density Functional Theory
