Delta H = Delta B region in volume defect-dominating superconductor

Abstract

It has been generally accepted that the diamagnetic property of type II superconductor decreases after H c1 . On the other hand, we found that (Fe, Ti) particle-doped MgB 2 specimens have a ∆H = ∆B region in the M-H curves, which is the region that the increase of a magnetic induction is as much as the increase of an applied magnetic field. Here we study whether this phenomenon was only confined to (Fe, Ti) particle-doped MgB 2 superconductor, whether there is a theoretical basis, and why it does not appear in other superconductors. The cause of the ∆H = ∆B region