Magnetic Field Induced Pinning Effect in YBa2Cu3O7−δ + BaZrO3 Superconductor

Abstract

YBCO + BaZrO3 composites were prepared through solid state route employing nitrate precursors of BZO yielding submicron particles. In fact, presence of BZO brings about a significant modification in the microstructure of the composites. The resistive broadening in the tail part is suggested to be associated with the link between the grains and to be extremely sensitive to magnetic field. The magneto-resistance of the samples has been investigated within the thermally activated flux creep (TAFC) and Ambegaokar and Halperin (AH) phase slip models. It is assumed that the global zero resistance state at Tc0 region of HTSC are governed by the excitations in the weak link network. Invoking Beans critical state model, enhancement of Jc in composite samples in presence magnetic field at temperature (T) of 40 K has been observed.