lower critical field

lower critical field

[¦lō·ər ¦krid·i·kəl ′fēld]
(solid-state physics)
The magnetic field strength below which magnetic flux is completely excluded from type II superconductor and above which it penetrates the superconductor as microscopic filaments called fluxoids. Symbolized Hc1.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.