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

Q. Q. Liu·H. Yang·X. M. Qin·Y. Yu·L. X. Yang·F. Y. Li·R. C. Yu·C. Q. Jin·S. Uchida
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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.

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Q. Q. Liu, H. Yang, X. M. Qin, Y. Yu, L. X. Yang, F. Y. Li, R. C. Yu, C. Q. Jin, S. Uchida. 2006-11-16. Enhancement of the superconducting critical temperature of Sr2CuO3+d up to 95K by ordering dopant atoms. https://doi.org/10.1103/physrevb.74.100506

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