Abstract
The problem of pinning of flux-lines by random inhomogeneities is discussed. The theory of collective pinning, which was established recently by Larkin and Ovchinnikov and has proven successful in weak-pinning amorphous alloys, is discussed in some detail. Then computer simulation of pinning is described and the results are discussed. They confirm collective pinning theory for weak two-dimensional pinning and modify it at strong pinning where the flux-line lattice becomes amorphous. The threshold-behaviour predicted by the “dilute limit theories” proves to be an artifact which is due to the non-existence of this limit in sufficiently large specimens.
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