Physicists identify mechanisms behind high-temperature superconductivity

Researchers have made significant strides in understanding high-temperature superconductivity, specifically within copper-oxide ceramics known as cuprates. A study led by the University of Bristol suggests that fluctuating electron spins enable electrons to form Cooper pairs, allowing electricity to flow with zero resistance.

To investigate this, an international team of scientists created an artificial thin-film sample of lanthanum cerium copper oxide. By using lithography to pattern electrical contacts and applying strong magnetic fields at the European Magnetic Field Laboratory, they were able to observe how resistance changes across different critical temperatures while maintaining identical material disorder.

Complementary research led by Canada’s National Institute of Scientific Research (INRS) suggests a different layer of complexity. Their findings indicate a competition between two quantum states, suggesting that a phenomenon known as a pseudogap may actually compete for control of a material's electrons rather than facilitating superconductivity. These combined insights aim to eventually allow for the design of superconductors that function without extreme cooling systems.