Ultrathin nickelate film reveals unconventional superconducting pairing
Researchers investigating La₃Ni₂O₇ thin films found superconductivity near 80 K under high pressure, with evidence pointing to an electron-pairing mechanism distinct from the d-wave pairing seen in cuprates. The study, published in Nature Physics, suggests that engineered bilayer nickelate films could offer a new platform for exploring high-temperature superconductivity. This finding challenges existing models of unconventional superconductors and may inform future materials design.
The discovery centers on a bilayer nickelate compound that becomes superconducting at roughly 80 kelvin when subjected to high pressure. This temperature is notably higher than conventional superconductors, though still below the record-setting cuprates. The key finding is that the electron-pairing mechanism differs from the d-wave pairing observed in cuprates, suggesting a distinct pathway to superconductivity.
The work, appearing in Nature Physics, positions engineered thin-film nickelates as a promising experimental platform. By controlling the bilayer structure, researchers can probe how electron interactions give rise to unconventional superconductivity. This challenges current theoretical models and could guide the design of new superconducting materials.
The potential impact of this research is significant for energy and technology sectors. If nickelate-based superconductors can be understood and eventually engineered to operate at higher temperatures and lower pressures, they could enable lossless power transmission, more efficient magnetic resonance imaging, and advanced quantum computing components. Researchers and materials scientists may gain new design principles