Out of plane effect on the superconductivity of Sr2-xBaxCuO3+d with Tc up to 98K
T. H. Geballe, M. Marezio
TL;DR
This paper discusses the factors influencing the high superconducting transition temperature in Sr2-xBaxCuO3+d, emphasizing oxygen ordering over volume increase and challenging previous disorder effect assumptions.
Contribution
It provides an alternative explanation for the enhanced Tc in Sr2-xBaxCuO3+d, focusing on oxygen ordering rather than volume change or disorder effects.
Findings
Enhanced Tc linked to oxygen ordering
Volume increase not primary factor
Disorder effects overestimated in prior studies
Abstract
We comment on the paper published by W.B. Gao, Q.Q. Liu, L.X. Yang, Y.Yu, F.Y. Li, C.Q. Jin and S. Uchida in Phys. Rev. B 80, 094523 (2009) and give alternate explanations for the enhanced superconductivity. The enhanced onset Tc of 98K observed upon substituting Ba for Sr is attributed to optimal oxygen ordering rather than to the increase in volume. Comparison with La2CuO(4+x) samples suggest that the effect of disorder is overestimated.
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