Magnetic And Mossbauer Studies Of The Superconductor Eu(Dy,Gd)Ba2cu3o7-Delta

The changes of the microstructures of bulk single-phase Eu1-xDyxBa2Cu3O7-delta and Eu1-yGdyBa2Cu3O7-delta superconductors due to (Dy, Gd)-doping were investigated by the Mossbauer effect. The pinning potentials of the samples were calculated by magnetization relaxation analysis. The interaction between the magnetic moment of magnetic rare-earth cations and flux lines in these samples was considered as a predominant pinning mechanism in high T-c superconductors in this paper.