superconducting transition

https://doi.org/10.1351/goldbook.S06137
A transition at the critical temperature, Tc, below which the resistance of electrical conductors becomes zero and magnetic flux is excluded. Examples: The transitions of Nb3Sn, Nb3Al and V3Si to superconductors (15 K<Tc<20 K) and YBa2Cu3O7-x (x0.2) at 90 K.
Source:
PAC, 1994, 66, 577. (Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations 1994)) on page 592 [Terms] [Paper]