Anomalously strong near-neighbor attraction in doped 1D cuprate chains
Anomalously strong near-neighbor attraction in doped 1D cuprate chains
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DOI：
10.1126/science.abf5174
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发表时间：
2021-09-10
期刊：
影响因子：
56.9
通讯作者：
Shen, Zhi-Xun
中科院分区：
文献类型：
--
作者：
Chen, Zhuoyu;Wang, Yao;Shen, Zhi-Xun
在铜酸盐中，由于可靠理论的可用性，一维 (1D) 链化合物为理解微观物理提供了独特的机会。然而，可控掺杂这些材料的挑战限制了进展。我们报告了大范围空穴掺杂的一维铜酸盐 Ba2-xSrxCuO3+delta 的合成和光谱分析。我们的角度分辨光电发射实验揭示了完整子和自旋子分支的掺杂演化。我们发现了一个突出的折叠分支，其强度与简单哈伯德模型的预测不符。声子耦合可能产生的额外的强近邻吸引力定量地解释了所有可达到的掺杂水平的实验。考虑到铜酸盐之间结构和量子化学的相似性，这种吸引力可能在高温铜酸盐超导体中发挥同样重要的作用。
In the cuprates, one-dimensional (1D) chain compounds provide a distinctive opportunity to understand the microscopic physics, owing to the availability of reliable theories. However, progress has been limited by the challenge of controllably doping these materials. We report the synthesis and spectroscopic analysis of the 1D cuprate Ba2-xSrxCuO3+delta over a wide range of hole doping. Our angle-resolved photoemission experiments reveal the doping evolution of the holon and spinon branches. We identify a prominent folding branch whose intensity fails to match predictions of the simple Hubbard model. An additional strong near-neighbor attraction, which may arise from coupling to phonons, quantitatively explains experiments for all accessible doping levels. Considering structural and quantum chemistry similarities among cuprates, this attraction may play a similarly important role in high-temperature cuprate superconductors.