Detection of Zhang-Rice singlets using spin-polarized photoemission

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. T...

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Bibliographic Details
Published in:Physical review letters 2001-12, Vol.87 (23), p.237003-237003, Article 237003
Main Authors: Brookes, N B, Ghiringhelli, G, Tjernberg, O, Tjeng, L H, Mizokawa, T, Li, T W, Menovsky, A A
Format: Article
Language:English
Subjects:
cuo
electronic-structure
la2-xsrxcuo4
la2cuo4
oxides
resonant-photoemission
stability
states
superconductivity
t-j model
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Summary: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.
ISSN:0031-9007
1079-7114
1079-7114
DOI:10.1103/physrevlett.87.237003