锶的非谐性与顶氧电荷晶格动力学的关联及其与铜氧化物超导性的耦合
Correlation of strontium anharmonicity with charge-lattice dynamics of the apical oxygens and their coupling to cuprate superconductivity
摘要：
过掺杂超导体$YSr_2Cu_{2.75}Mo_{0.25}O_{7.54}$和$Sr_2CuO_{3.3}$的Cu K边X射线吸收谱表明，它们的超导电性与Cu-Sr和Cu-apical-O对的局域动力学有很强的相关性。这一发现，整个碱土金属阳离子顶端的O“电介质”层具有积极的作用，在不寻常的电子性质的铜酸盐以前没有被考虑，并具有深远的影响。我们开发了这种想法的一个可能的作用的顶端氧电荷动力学通过软模式的Sr通过应用仓本的同步技术精确对角化计算的两个相邻的Cu顶端O对桥由Sr和平面O原子。这些计算表明，一级相变到同步状态的内部量子隧穿极化子（IQTP），其中一小部分原来局限于顶端的O原子的集群被转移到平面O。实验结果和理论的结合表明，铜酸盐的Sr-O介电层最有可能通过其延伸到$CuO_2$导电平面的集体电荷动力学在高温超导性中起重要作用。
英文摘要：
Cu K edge X-ray absorption spectra of overdoped superconducting $YSr_2Cu_{2.75}Mo_{0.25}O_{7.54}$ and $Sr_2CuO_{3.3}$ show a remarkably strong correlation of their superconductivity with the local dynamics of their Cu-Sr and Cu-apical-O pairs. This finding that the entire alkaline earth cation-apical O "dielectric" layer has an active role in the unusual electronic properties of cuprates has not been previously considered and has far reaching implications. We develop this idea of a possible role for the apical oxygen charge dynamics via a soft mode of the Sr by applying Kuramoto's synchronization technique to exact diagonalization calculations of two neighboring Cu-apical O pairs bridged by Sr and a planar O atom. These calculations show a first order phase transition to a synchronized state of the Internal Quantum Tunneling Polarons (IQTPs) in which a fraction of the hole originally confined to the apical O atoms of the cluster is transferred onto the planar O. This combination of experimental results and theory demonstrates that the Sr-O dielectric layer of cuprates most likely plays an important role in high temperature superconductivity via its collective charge dynamics that extends into the $CuO_2$ conducting planes.
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