论文标题
揭示掺杂的铜酸盐超导体中的旋转激发的性质
Unravelling the Nature of Spin Excitations Disentangled from Charge Contributions in a Doped Cuprate Superconductor
论文作者
论文摘要
超导铜酸盐中自旋激发的性质是统一理解从远距离抗fiferromagnetism到超导性的统一理解的关键问题。引起的激烈的旋转激发，引起了共鸣的非弹性X射线散射所揭示的过度兴奋，带来了新的见解以及如何理解其持久性或以有序的磁铁（镁质）与集体激发的关系等问题。在这里，我们研究了旋转兴奋的兴奋剂时，通过将旋转与实验横截面中的电荷激励相同，使超导cuprate cuprate bi $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _ {8+δ} $。我们将实验结果与在方格上的$ t $ - $ j $类模型的密度矩阵重新归一化组计算进行了比较。我们的结果明确地证实了自旋激发的持续性，这些激发与短距离磁相关性的持久性紧密相关，直到高掺杂。这表明掺杂孔层中的自旋激发与少量有关 - 尽管短距离。
The nature of the spin excitations in superconducting cuprates is a key question toward a unified understanding of the cuprate physics from long-range antiferromagnetism to superconductivity. The intense spin excitations up to the over-doped regime revealed by resonant inelastic X-ray scattering bring new insights as well as questions like how to understand their persistence or their relation to the collective excitations in ordered magnets (magnons). Here, we study the evolution of the spin excitations upon hole-doping the superconducting cuprate Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ by disentangling the spin from the charge excitations in the experimental cross section. We compare our experimental results against density matrix renormalization group calculations for a $t$-$J$-like model on a square lattice. Our results unambiguously confirm the persistence of the spin excitations, which are closely connected to the persistence of short-range magnetic correlations up to high doping. This suggests that the spin excitations in hole-doped cuprates are related to magnons -- albeit short-ranged.
