Destabilization of the Zhang-Rice singlet at optimal doping

Details Destabilization of the Zhang-Rice singlet at optimal doping Destabilization of the Zhang-Rice singlet at optimal doping

2009-04-22

arxiv.org/abs/0904.3451v1

JETP 109 (2009), 4; 652-658

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 2 figures, to appear in JETP

Scientific paper

10.1134/S1063776109100100

The construction of the Zhang-Rice singlet is revisited in the light of recent understanding of high-temperature superconductors at optimal doping. A minimal local model is derived which contains the physical regime found relevant for ARPES experiments, characterized by significant direct oxygen-oxygen hopping. For the values of orbital parameters indicated by experiment, the Zhang-Rice singlet is strongly mixed with a pure oxygen singlet of the same symmetry. The destabilization of the Zhang-Rice ground state is due to the oxygen singlet having twice as large a coherence factor with respect to oxygen-oxygen hopping. An analogous quantum phase transition is identified in the t-t'-J model. The orbital-antisymmetric copper-oxygen singlet is confirmed to be irrelevant, as found originally. The usual symmetry analysis is extended to include dynamical symmetries.

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