Resonance-valence-bond superconductivity in CuO{sub 2} planes
- Comision Nacional de Energia Atomico, de Bariloche (Argentina)
The authors find the exact ground state of a system of 4 x 4 unit cells described by an effective model for cuprate superconductors. The model has the form of the t-J one, but includes a three-site term t{double_prime} like that derived from the Hubbard model in the large U limit, but of opposite sign for realistic or large O-O hopping. For t{double_prime} > t{double_prime}{sub c} (where t{double_prime}{sub c}/t {approximately} 0.1 for realistic J and doping) the system undergoes a transition to a phase in which the ground state has a significant overlap with a very simple superconducting resonance-valence-bond (RVB) wave function. In the RVB phase there is a large increase of the d-wave superconducting susceptibility. The authors calculate the boundary of the RVB phase.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 457218
- Report Number(s):
- CONF-960808-; ISSN 0022-2291; TRN: 97:012214
- Journal Information:
- Journal of Low Temperature Physics, Vol. 105, Issue 3-4; Conference: 3. international conference on physics and chemistry of molecular and oxide superconductors, Karlsruhe (Germany), 2-6 Aug 1996; Other Information: PBD: Nov 1996
- Country of Publication:
- United States
- Language:
- English
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