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Scaling of transition temperature and CuO_2 plane buckling in a high-temperature superconductor

机译:高温超导体中转变温度的定标和CuO_2平面屈曲

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A characteristic feature of the high-temperature superconductors is the existence of a chemical composition that gives a maximum transition temperature, T_c, separating the so-called under-doped and over-doped regimes. This behaviour is thought to be universal for high-temperature superconductors. In practice, there are only a few high-T_c compounds for which the composition can be varied continuously throughout the entire doping range. Here we report a study of correlations between structure and T_c in a compound with the '123' structure in which both the under-doped and over-doped regimes can be accessed. We observe a clear scaling between T_c and the buckling of the copper oxide planes; both go through a maximum at the same oxygen composition (and hence doping level), so implying a common origin. Previous work has shown that, for a fixed chemical composition, increased CuO_2 plane buckling lowers the transition temperature. Thus the observation of a maximum in the budding at the maximum T_c indicates that, as the composition is changed to increase T_c, there is a structural response that competes with superconductivity.
机译:高温超导体的一个特征是存在化学成分,该化学成分给出了最大的转变温度T_c,从而将所谓的掺杂不足和掺杂过度区分开。这种行为被认为对于高温超导体是普遍的。实际上,只有很少的高T_c化合物,其组成可以在整个掺杂范围内连续变化。在这里,我们报告了对具有“ 123”结构的化合物中的结构与T_c之间的相关性的研究,在该结构中可以访问掺杂不足和掺杂过度的体系。我们观察到T_c和氧化铜平面的屈曲之间存在明显的比例关系。两者在相同的氧组成下(并因此在掺杂水平上)经历最大值,因此暗示了共同的起源。先前的工作表明,对于固定的化学组成,增加的CuO_2平面屈曲会降低转变温度。因此,观察到萌芽中的最大值T_c最大,这表明,随着组成的变化以增加T_c,存在与超导竞争的结构响应。

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