, below which the resistance of electrical conductors becomes zero and magnetic flux is excluded. Examples:
The transitions of
Nb3Sn,
Nb3Al and
V3Si
to superconductors
(
) and
YBa2Cu3O7-x
(
) at
.
Source:
PAC, 1994, 66, 577
(Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations 1994))
on page 592