Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland.
MESA+ Institute for Nanotechnology, University of Twente, Post Office Box 217, 7500AE Enschede, The Netherlands.
Sci Rep. 2016 Sep 12;6:32896. doi: 10.1038/srep32896.
The recently discovered structural reconstruction in the cuprate superlattice (SrCuO2)n/(SrTiO3)2 has been investigated across the critical value of n = 5 using resonant inelastic x-ray scattering (RIXS). We find that at the critical value of n, the cuprate layer remains largely in the bulk-like two-dimensional structure with a minority of Cu plaquettes being reconstructed. The partial reconstruction leads to quenching of the magnons starting at the Γ-point due to the minority plaquettes acting as scattering points. Although comparable in relative abundance, the doped charge impurities in electron-doped cuprate superconductors do not show this quenching of magnetic excitations.
最近在铜酸盐超晶格（SrCuO2）n/（SrTiO3）2 中发现的结构重构已经使用共振非弹性 x 射线散射（RIXS）在 n=5 的临界点进行了研究。我们发现，在 n 的临界点，铜酸盐层仍然保持在类似于体的二维结构，只有少数的 Cu 薄片被重构。由于少数薄片充当散射点，部分重构导致Γ点处的磁振子猝灭。尽管掺杂电荷杂质在电子掺杂铜酸盐超导体中的相对丰度相当，但它们不会表现出这种磁激发的猝灭。
