Stability of composite superconductors with high resistive barriers

Current distribution in a composite superconductor (CS) with high resistive barriers between the superconducting filaments and a stabilizing matrix in the presence of a normal zone is calculated. Normal zone propagation current is studied analytically, it appears to be strongly dependent on the normal zone length. It is concluded that normal zones exist which are stable with respect to current variations. A classification of CS evolution based on transport current and normal zone length is presented. (author)