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Variation of Oxygen Pressure in Growing Bi2Sr2CaCu2O8+δ Single Crystal Superconductors and its Effects

Darminto, A.A. Nugroho, A. Rusydi, A.A. Menovsky & W. Loeksmanto


Abstract. This paper presents the results of growing Bi2Sr2CaCu2O8+δ single crystal superconductors by means of traveling  solvent floating zone (TSFZ) method in various atmospheres, namely in air and in oxygen (O2) of 1 and 2.5 bar. Variations of oxygen contents due to different atmospheres in the growing process lead to a variety of molar compositions of the as-grown crystals as well as formation of impurity phases. It is found from the result of sample characterization that the incrcase of oxygen content in the crystal lowers its critical temperature (Tc) and anisotropy (γ). Further the lowering of anisotropy incrcases the second peak field (H2p) and causes a shift of the irreversibility line (Hirr) to the higher temperature and magnetic field in the H-T phase diagram, signifying the enhancement of vortex pinning effect due to increasing concentration of oxygen dopant.

Keywords: single crystal; superconductors; oxygen doping; anisotropy; magnetic properties; pinning effect

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