论文标题
现场库仑排斥对大量掺杂的铜层中铁磁波动的影响
Effect of on-site Coulomb repulsion on ferromagnetic fluctuations in heavily over-doped cuprates
论文作者
论文摘要
我们从理论上研究了在铜酸盐超导体的重量超过的区域中实验观察到的铁磁（FM）波动。为了探索FM波动的起源，我们评估了波动交换近似中单频哈伯德模型的自旋敏感性。使用Wannierization技术和基于最大局部Wannier函数的约束随机相位近似方法得出模型参数。受约束的随机相位近似计算表明，现场库仑相互作用随孔掺杂的增加而降低。通过考虑现场库仑相互作用的减少，可以解释大量过高的铜层中FM波动的出现。
We theoretically study ferromagnetic (FM) fluctuations that are experimentally observed in the heavily overdoped region of cuprate superconductors. To explore the origin of FM fluctuations, we evaluate the spin susceptibilities of a single-band Hubbard model within the fluctuation exchange approximation. Model parameters are derived using the Wannierization technique and the constrained random phase approximation method based on the maximally localized Wannier functions. The constrained random phase approximation calculations reveal that the on-site Coulomb interaction decreases with an increase in hole doping. By taking this reduction of the on-site Coulomb interaction into account, the emergence of FM fluctuations in heavily overdoped cuprates can be explained.
