Researchers at Chalmers University of Technology in Sweden have found a new way to dramatically improve superconductors — not by changing their chemistry, but by carving nanoscale ridges and valleys into the surface they rest on. The team showed that these tiny engineered patterns stabilize superconductivity at higher temperatures and under much stronger magnetic fields, a combination previously thought to require entirely new materials.
The breakthrough uses ultrathin films of yttrium barium copper oxide (a cuprate superconductor) laid on a specially prepared magnesium oxide substrate. By pre-treating the substrate at high temperatures in a vacuum to create precise surface structures just nanometers wide, the researchers altered how electrons behave in the overlying film — without touching its chemical composition. The work, published in Nature Communications and involving teams from Sweden, Italy, France, Germany and India, was led by professor Floriana Lombardi.
Electronics currently consume an estimated 6–12% of global electricity. Superconductors, which conduct electricity with zero resistance, could slash that figure — but existing superconductors still require cooling to around minus 200°C and struggle under strong magnetic fields used in MRI machines, quantum computers and power grids. The Chalmers approach offers a practical new design principle for overcoming both barriers simultaneously.