Study on excess magnetoconductivity in (1−x)YBa2Cu3O7 + xBaTiO3 composites

► BaTiO3 resides on the grain boundary of granular YBCO matrix. ► A shoulder appears on temperature derivative of resistivity for zero fields. ► Magnetic field results in broadening of resistivity. ► Fluctuation crossover from 2D to 3D above Tc is observed.