The Magnetic Field Distribution of Superconducting Alloys with Small Magnetization

The magnetic field distribution of type‐II superconductors with arbitrary concentration of non‐paramagnetic and paramagnetic impurities is calculated near H c2 for 0 ≦ T < T c . At a certain temperature T , depending on the impurity concentration, minimum and saddle point of H interchange their positions. At very low T , the reduced magnetization |4π M | B/N 〈|Δ| 2 〉 reaches a maximum at a certain impurity concentration, but even a small concentration of paramagnetic impurities inhibits this effect. The new H leads to a correction of the χ 2 ‐theory.