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

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dc.creatorHobou, H.
dc.creatorIshida, S.
dc.creatorFujita, K.
dc.creatorIshikado, M.
dc.creatorKojima, K. M.
dc.creatorEisaki, H.
dc.creatorUchida, S.
dc.date2009-04-17
dc.date.accessioned2026-07-07T13:05:36Z
dc.date.available2026-07-07T13:05:36Z
dc.descriptionWe 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$_{8+δ}$ (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 ($ρ_0$) 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 $ρ_0$ 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.
dc.description7 pages, 1 table, 5 figures
dc.identifierhttps://arxiv.org/abs/0904.2613
dc.identifierhttp://arxiv.org/abs/0904.2613
dc.identifierPhys. Rev. B 79, 064507 (2009)
dc.identifierdoi:10.1103/PhysRevB.79.064507
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/227537
dc.subjectSuperconductivity
dc.titleEnhancement of the superconducting critical temperature in Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ by controlling disorder outside CuO$_2$ planes
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