Effect of chemical inhomogeneity in the bismuth-based copper oxide superconductors

Details Effect of chemical inhomogeneity in the bismuth-based copper oxide superconductors Effect of chemical inhomogeneity in the bismuth-based copper oxide superconductors

2003-12-22

arxiv.org/abs/cond-mat/0312570v1

Phys. Rev. B 69, 064512 (2004)

Physics

Condensed Matter

Superconductivity

9 pages, 3 figures, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.69.064512

We examine the effect on the superconducting transition temperature (Tc) of chemical inhomogeneities in Bi2201 and Bi2212 single crystals. Cation disorder at the Sr crystallographic site is inherent in these materials and strongly affects the value of Tc. Partial substitution of Sr by Ln (Ln = La, Pr, Nd, Sm, Eu, Gd, and Bi) in Bi_{2}Sr_{1.6}Ln_{0.4}CuO_{6} results in a monotonic decrease of Tc with increasing ionic radius mismatch. By minimizing Sr site disorder at the expense of Ca site disorder, we demonstrate that the Tc of Bi2212 can be increased to 96 K. Based on these results we discuss the effects of chemical inhomogeneity in other bulk high-temperature superconductors.

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