## superconducting transition

https://doi.org/10.1351/goldbook.S06137
A transition at the critical temperature, $$T_{\text{c}}$$, below which the resistance of electrical conductors becomes zero and magnetic flux is excluded. Examples: The transitions of Nb3Sn, Nb3Al and V3Si to superconductors ($$15\ \text{K} < T_{\text{c}} < 20\ \text{K}$$) and YBa2Cu3O7-x ($$x\approx 0.2$$) at $$90\ \text{K}$$.
Source:
PAC, 1994, 66, 577. 'Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations 1994)' on page 592 (https://doi.org/10.1351/pac199466030577)