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Sökning: WFRF:(Menovsky T)

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  • Brookes, N. B., et al. (författare)
  • Detection of Zhang-Rice singlets using spin-polarized photoemission
  • 2001
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 8723:23
  • Tidskriftsartikel (refereegranskat)abstract
    • From a spin-resolved photoemission study on the Bi2Sr2CaCu2O8+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.
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  • Ghiringhelli, G., et al. (författare)
  • Probing the singlet character of the two-hole states in cuprate superconductors
  • 2002
  • Ingår i: Physica. B, Condensed matter. - 0921-4526 .- 1873-2135. ; 312, s. 34-35
  • Tidskriftsartikel (refereegranskat)abstract
    • Using spin-resolved resonant photoemission we have probed the singlet vs. triplet character of the two-hole state in the layered cuprates Bi2Sr2CaCu2O8+delta La2-xSrxCuO4 and Sr2CuO2Cl2. The combination of the photon circular polarization with the photoelectron spin detection gives access to the character of the photoemission final states, which correspond to the two-hole configurations localized at a (CuO4) site. In particular, the lowest energy state is found to have a very high singlet character in all the measured compounds. This can be considered as a strong indication of the existence and stability of the so-called Zhang-Rice singlets in the layered cuprates.
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