科研之友
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摘要
The mixed valence character of the holes at: Cu(3d(x2-y2)) and O(2p(sigma)) orbitals in copper oxides is implemented by wave-function corrections to the spin-fermion model. We show that the hybridization effects lead to drastic changes in the distribution of spectral weight and the dispersion of the quasiparticle band with decreasing charge-transfer energy a. For Delta = 2.0-3.0 eV the quasiparticle dispersion resembles that of the t-J model with extended hopping and agrees qualitatively with the experimental data in insulating Sr2CuO2Cl2, demonstrating that the quasiparticle states due to p(sigma) orbitals play the dominating role for the realistic parameters. [S0163-1829(98)05238-2].
- 出版日期1998-10-1
