Brookes N B, Ghiringhelli G, Tjernberg O, Tjeng L H, Mizokawa T, Li T W, Menovsky A A
European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble, France.
Phys Rev Lett. 2001 Dec 3;87(23):237003. doi: 10.1103/PhysRevLett.87.237003. Epub 2001 Nov 15.
From a spin-resolved photoemission study on the Bi(2)Sr(2)CaCu(2)O(8+delta) superconductor, we show experimentally that the first ionization state is of nearly pure singlet character. This is true both above and below the superconducting transition and in the presence of doping and band formation. This provides direct support for the existence and stability of Zhang-Rice singlets in high-temperature superconductors, justifying the ansatz of single-band models. Moreover, we establish this technique as an important probe for a wide range of cuprates and strongly correlated materials.
通过对Bi(2)Sr(2)CaCu(2)O(8+δ) 超导体进行自旋分辨光电子能谱研究，我们通过实验表明，第一电离态具有近乎纯的单重态特征。这在超导转变温度之上和之下，以及存在掺杂和能带形成的情况下都是如此。这为高温超导体中张 - 赖斯单重态的存在和稳定性提供了直接支持，证明了单带模型假设的合理性。此外，我们将该技术确立为研究多种铜酸盐和强关联材料的重要探针。
