A new single crystal growth method of (Bi,Pb)_2Sr_2CaCu_2O_z superconductor

摘要

A new method was developed to elaborate (Bi,Pb)_2Sr_2CaCu_2O_x (Pb-2212) single crystals. The new process makes use of a progressive increase of the oxygen chemical potential in gaseous phase t a constant temperature 875 deg C below the incongruent melting temperature (T=884 deg C) of the Pb-2212. The composition of this crystal is homogeneous and very close to the stoichiometric composition. Structure characterization of a single crystal was realized by measuring the (0 0 1) X-ray diffraction intensity. The superconducting temperature T_c(0)=90 K with a sharp transition width (10-90/100 level) between 5 and 10 K was determined form receptivity and DC susceptibility measurements.