Bi-2212 high-Tc superconductor nanoparticles synthesized via wet-mixing method and its properties

Abstract

We have synthesized a type of Bi-based high-Tc cuprate superconductors, Bi2Sr2CaCu2O8 and Bi1.6Pb,PbSr2CaCu2O8, henceforth called Bi-2212 and (Bi,Pb)-2212, respectively, using wet-  mixing method. Here we report the investigation of structure, superconductivity and  magnetism on Bi-2212 and (Bi,Pb)-2212 nanoparticles. XRD result confirmed the presence  of Bi-2212 as a dominant phase with the orthorhombic structure. SQUID measurement  confirmed the presence of superconductivity of both samples by the observation of Tc onset  at the temperature around 75 K and 78 K and displayed that (Bi,Pb)-2212 has higher  superconducting volume fraction compared to that of Bi-2212. The difference between Tirr  and Tonset is attributed to the difference flux pinning in both Bi-2212 and (Bi,Pb)-2212.  Furthermore, nanoparticles of superconducting Bi-2212 exhibit ferromagnetism at room temperature.