论文标题
模拟过多的铜层的超导特性：不均匀性的作用
Simulating Superconducting Properties of Overdoped Cuprates: the Role of Inhomogeneity
论文作者
论文摘要
无序的$ d $ - 波超导体的理论研究将重点放在具有强散射器的最佳掺杂模型上。然而，解决有关过度铜质的性质的最新争议，需要研究与掺杂原子相关的较弱散射。在这里，我们研究了自洽的Bogoliubov-De Gennes（BDG）框架中此类系统的简单模型，并使用自辅抗T-Matrix-approximation（SCTMA）进行比较与无序平均结果进行比较。尽管即使对于完全无序的系统，状态低能密度的能量行为令人惊讶，但在这种情况下，超流体密度仍保留了渗透深度的二次低温变化，这与最近报告的其他BDG结果不同。我们将差异追溯到该工作中使用的较小有效系统尺寸。总体而言，SCTMA的性能非常出色，除了高度抑制的超氟密度的高度无序系统外。我们探索了这个有趣的区域，其中间隙不均匀性主导了测得的超导特性，并与过多的酸奶物进行了比较。
Theoretical studies of disordered $d$-wave superconductors have focused, with a few exceptions, on optimally doped models with strong scatterers. Addressing recent controversies about the nature of the overdoped cuprates, however, requires studies of the weaker scattering associated with dopant atoms. Here we study simple models of such systems in the self-consistent Bogoliubov-de Gennes (BdG) framework, and compare to disorder-averaged results using the self-consistent-T-matrix-approximation (SCTMA). Despite surprisingly linear in energy behavior of the low-energy density of states even for quite disordered systems, the superfluid density in such cases retains a quadratic low-temperature variation of the penetration depth, unlike other BdG results reported recently. We trace the discrepancy to smaller effective system size employed in that work. Overall, the SCTMA performs remarkably well, with the exception of highly disordered systems with strongly suppressed superfluid density. We explore this interesting region where gap inhomogeneity dominates measured superconducting properties, and compare with overdoped cuprates.
