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We address the question of whether the superconducting transition temperature(Tc) of high-Tc cuprates is enhanced when randomly distributed dopant atomsform an ordered array in the charge reservoir layers. This study is possiblefor the Sr2CuO3+d superconductor with K2NiF4-type structure in which oxygenatoms only partially occupy the apical sites next to the CuO2 planes and act ashole-dopants. We show that remarkable Tc enhancement up to 95K in this monoCuO2 layered HTS is associated with the apical oxygen ordering, not to the holeconcentration change. The result points a route toward further enhancement ofTc in cuprate superconductors.Comment: 18 pages, 5 Figure

physical review. b, condensed matter and materials physics

Enhancement of the superconducting critical temperature of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>CuO</mml:mi><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>up to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>95</mml:mn><mml:mspace width="0.3em" /><mml:mi mathvariant="…

Enhancement of the superconducting critical temperature ofSr2CuO3+δup to95