Issue |
Europhys. Lett.
Volume 38, Number 2, April II 1997
|
|
---|---|---|
Page(s) | 147 - 152 | |
Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
DOI | https://doi.org/10.1209/epl/i1997-00216-4 | |
Published online | 01 September 2002 |
Superconductivity and incommensurate spin fluctuations in a generalized t-J model for the cuprates
1
Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica - 8400 Bariloche, Argentina
2
Instituto de Física de Rosario, Boulevard 27 de Febrero 210 bis, 2000 Rosario, Argentina
Received:
6
November
1996
Accepted:
10
March
1997
We consider the slave-fermion Schwinger-boson decomposition of an effective model obtained through a systematic low-energy reduction of the three-band Hubbard Hamiltonian. The model includes a three-site term similar to that obtained in the large-U limit of the Hubbard model but of opposite sign for realistic or large O-O hopping. For parameters close to the most realistic ones for the cuprates, the mean-field solution exhibits d+s superconductivity (predominantly ) with a dependence on doping x very similar to the experimentally observed. We also obtained incommensurate peaks at wave vectors in the spin structure factor, which also agree with experiment.
PACS: 74.20.-z – Theories and models of superconducting state / 75.10.Jm – Quantized spin models
© EDP Sciences, 1997
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