Enhancement of the superconducting critical temperature of Sr2CuO3+d up to 95K by ordering dopant atoms

Abstract

We address the question of whether the superconducting transition temperature (Tc) of high-Tc cuprates is enhanced when randomly distributed dopant atoms form an ordered array in the charge reservoir layers. This study is possible for the Sr2CuO3+d superconductor with K2NiF4-type structure in which oxygen atoms only partially occupy the apical sites next to the CuO2 planes and act as hole-dopants. We show that remarkable Tc enhancement up to 95K in this mono CuO2 layered HTS is associated with the apical oxygen ordering, not to the hole concentration change. The result points a route toward further enhancement of Tc in cuprate superconductors.

18 pages, 5 Figures

References in corpus (4)

• Band-structure trend in hole-doped cuprates and correlation with Tcmax
• Effect of chemical inhomogeneity in the bismuth-based copper oxide superconductors
• Effect of disorder outside the CuO${}_2$ planes on $T_c$ of copper oxide superconductors
• High pressure synthesis of a new superconductor Sr2CuO2+xCl2-y induced by apical oxygen doping

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