New type of mixed state with positive magnetization in high-temperature superconductors
Valiulin E. G. , Druzhinin A. A., Startsev V. E., Shcherbakov A. S.
It has been observed that the magnetization of high-temperature superconductors cooled in an external magnetic field and held in it at Τ = 4.2 К eventually changes sign, becoming positive. It is suggested that this behavior results from the particular nature of the nucleation and evolution of the vortex structure in the superconductor.