Upper critical field

Upper critical field

=Upper critical field=

The magnetic field (usually expressed in teslas (T)) which completely suppresses superconductivity in a "Type II" superconductor at 0K (absolute zero).

More properly, the UCF is a function of temperature (and pressure) and if these are not specified absolute zero and standard pressure are implied.

Werthamer–Helfand–Hohenberg theory predicts the upper critical field (Hc2) at 0 K from Tc and the slope of Hc2 at Tc.

Articles on superconductivity use Hc2 or Bc2 interchangeably since the materials are rarely magnetic.

Lower critical field

The magnetic field at which the magnetic flux starts to penetrate a type-2 superconductor at 0 K (absolute zero).


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