Effect for Inhomogeneity by Pb Substitution on (Bi1-yPby)2Sr2Ca1-xYxCu2O8+δSingle Crystals


Inhomogeneity is one of the most important problems for the investigation of the superconductor-insulator transition. Y and Pb co-doped Bi2Sr2CaCu2O8+δ(PbY-Bi2212) crystals were fabricated by the self-flax method in order to control both carrier density and dimensionality. The Y-content of PbY-Bi2212 crystals was much wide distributed in the same crucible rather than that of only Y doping Bi2212 (Y-Bi2212) crystals. In order to clear the origin of inhomogeneity, crystals were characterized by wavelength-dispersive X-ray spectroscopy (WDS) and X-ray diffraction (XRD). One can estimate the Y-content of cleavage samples from the c-axis lattice parameter obtained by XRD because mainly Y-con- tent affects to c-axis lattice constant for both Y-Bi2212 and PbY-Bi2212 crystals. It found that there are some samples with multi-phases and the ratio of samples with multi-phase for PbY-Bi2212 crystals is larger than that for Y-Bi2212 crystals. The linear relation between Y-content and Pb-content were also found from WDS. Large inhomogeneity of Y-content may be induced from Pb-content inhomogeneity. Transport properties are strongly dependent to Y-content. However they cannot be explained only from the macroscopic chemical compositions of the substitution atom Y and Pb. It may be related to microscopic inhomogeneity.

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S. Komaki, Y. Kourogi, T. Murano, A. Furushima, S. Maeda, Y. Sawada, B. Saya, Q. Meng, T. Tsuneoka, F. Ichikawa and K. Itoh, "Effect for Inhomogeneity by Pb Substitution on (Bi1-yPby)2Sr2Ca1-xYxCu2O8+δSingle Crystals," Materials Sciences and Applications, Vol. 3 No. 12, 2012, pp. 829-832. doi: 10.4236/msa.2012.312120.

Conflicts of Interest

The authors declare no conflicts of interest.


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