Enhancement of the superconducting critical temperature in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ by controlling disorder outside CuO${}_2$ planes

Abstract

We investigate the effect of disorder at various lattice sites outside the CuO${}_2$ plane on the superconducting critical temperature $T_c$ of the cuprate superconductor Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ (Bi2212). The most effective disorder turns out to be that at the Sr site in the neighboring blocks, which contain apical-oxygen atoms. The Sr-site disorder reduces $T_c$ and also produces a residual component (${\rho }_0$) in the in-plane resistivity, the magnitude of which is found to be proportional to the magnitude of $T_c$ reduction. We demonstrate that both $T_c$-degradation rate and ${\rho }_0$ decrease as the number of the CuO${}_2$ planes increases in the unit cell, that is, as the number of the neighboring SrO blocks decreases. In real crystals of Bi-based cuprates, main source of disorder is Bi atoms randomly occupying the Sr sites. We have succeeded in reducing the Bi content at Sr-sites as much as possible and achieved $T_c$=98K, a high-$T_c$ record in Bi2212.

7 pages, 1 table, 5 figures

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