MICROSCOPIC MODEL OF THE CRITICAL-STATE IN HARD SUPERCONDUCTORS

We studied the penetration of the external magnetic field inside a har d superconductor within the scope of a microscopic discrete model. A m acroscopic description of this situation is usually carried out in the framework of the critical state model. The microscopic consideration is used to calculate the critical current density (for example, by mea ns of the theory of the collective pinning). The distribution of the v ortex positions and their stability were not studied. The purpose of t his paper is to solve these tasks for model picture of pinning.