论文标题
超导bi $ _2 $ sr $ _2 $ cacu $ _2 $ o $ $ _ {8+δ} $中的超导波动
Superconducting fluctuations in overdoped Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$
论文作者
论文摘要
超导性的波动 - 材料电阻状态下的残留库珀配对通常与尺寸低，强度强或载体密度低有关。在这里，我们报告了单个颗粒光谱，热力学和磁性证据，以持续的超导超导的波动，在供孔的高孔库酸酯超导体BI $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ o $ $ _ {8+δ} $ _ {8+δ} $（$ t_c $ = 66〜k）中，尽管是高crarsier rialier densect。通过符号 - 问题无量子蒙特卡洛计算，我们显示了（$π$，0）部分平坦的频段如何帮助增强超导相位波动。最后，我们讨论了各向异性条带结构对过度倒角和其他超导体中相位限制的超导性的含义。
Fluctuating superconductivity - vestigial Cooper pairing in the resistive state of a material - is usually associated with low dimensionality, strong disorder or low carrier density. Here, we report single particle spectroscopic, thermodynamic and magnetic evidence for persistent superconducting fluctuations in heavily hole-doped cuprate superconductor Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ ($T_c$ = 66~K) despite the high carrier density. With a sign-problem free quantum Monte Carlo calculation, we show how a partially flat band at ($π$,0) can help enhance superconducting phase fluctuations. Finally, we discuss the implications of an anisotropic band structure on the phase-coherence-limited superconductivity in overdoped cuprates and other superconductors.
