lower critical field
lower critical field[¦lō·ər ¦krid·i·kəl ′fēld]
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.