Superconductivity is a quantum property of materials entailing an electrical resistance of zero at very low temperatures. In some materials, multiple electronic bands are known to contribute to the emergence of superconductivity, leading to multiple superconducting energy gaps. This phenomenon is referred to as multiband superconductivity.

Researchers at Lund University in Sweden, Institut Laue Langevin in France and other institutes in Europe recently carried out a study aimed at better understanding the multiband superconductivity emerging in the transition metal dichalcogenide 2H-NbSe₂, which exhibits a vortex lattice when exposed to a magnetic field.

Their findings, published in Physical Review Letters, unveil two key contributions to the superconducting state observed in this material.