Scientists in Vancouver have identified a shared electronic signature across an exotic family of superconductors, bringing researchers closer to understanding why these materials conduct electricity with zero resistance—a property that could unlock advances in quantum computing, medical imaging, and power systems far more efficient than anything we have today.
The discovery, published in Nature Physics, comes from a collaboration between researchers at the University of British Columbia's Quantum Matter Institute, Argonne National Laboratory, and the Canadian Light Source. Using advanced spectroscopy called angle-resolved photoemission spectroscopy (ARPES), the team mapped what they call the electronic "fingerprint" of layered nickelates—a relatively new class of high-temperature superconductors made up of two-dimensional nickel-oxygen layers separated by rare-earth or lanthanide materials.
Superconductors have fascinated scientists for decades, but nickelates represent a recent breakthrough. Unlike most superconductors that only work at near-absolute-zero temperatures, nickelates exhibit superconductivity at unusually high temperatures, making them far more practical for real-world applications. "Discovering new superconductors is important both for fundamental science and for potential future technologies, including more efficient energy systems, advanced computing, and powerful magnets used in medical imaging," said Andrea Damascelli, principal investigator at UBC's Quantum Matter Institute and senior author of the study.
What makes nickelates particularly intriguing is how closely they mirror copper-based superconductors, or cuprates, which scientists have studied for decades. Yet nickelates remained largely overlooked as superconductors until very recently, when superconductivity was observed in layered nickelates under pressure. The UBC-led team wanted to understand whether nickelates truly shared the electronic DNA of cuprates, or whether they might reveal something fundamentally new about how superconductivity works.
The researchers focused on a compound called La₃Ni₂O₇, which can form different crystal structures. By studying bulk crystals of multilayered nickelates with varying structural arrangements, they discovered something striking: despite their differences, these materials all shared the same electronic fingerprint. That fingerprint is the Fermi surface—essentially the boundary between occupied and unoccupied electronic states. Its shape is crucial because it determines how conducting electrons move through the material, how they interact with one another, and ultimately how they form a superconducting state.
Graduate student Christine C. Au-Yeung, lead author of the study, explained the significance: "This fingerprint is the Fermi surface, which can be thought of as the boundary between occupied and unoccupied electronic states in a material. Its shape is extremely important because it tells us how the conducting electrons move through the material, how they interact with one another, and how they may eventually form a superconducting state."
The team's analysis revealed that the electronic states along the Fermi surface are dominated by oxygen-centered planar orbitals, including states with special symmetry that play a key role in both magnetic ordering and superconductivity. This finding echoes patterns seen in cuprates, suggesting a deeper universal principle at work—one that might apply across different families of unconventional superconductors.
The discovery opens new pathways for materials research. By identifying the essential electronic features that enable superconductivity in nickelates, scientists now have a clearer roadmap for either optimizing these materials or discovering similar compounds with even more desirable properties. The work underscores how fundamental research into materials science can illuminate the physics underlying technologies that could reshape energy production, computing, and medicine.