First type I superconductor breaking time-reversal symmetry discovered

Scientists have found the first type I superconductor that breaks time-reversal symmetry. The discovery expands understanding of the quantum properties of superconductors, which conduct electricity without resistance and expel magnetic fields at ultralow temperatures.

• First type I superconductor with broken time-reversal symmetry found
• Such behavior was previously thought unique to type II superconductors
• Superconductors carry current without resistance at ultralow temperatures
• The finding reshapes understanding of superconducting quantum structure