Resonance-valence-bond superconductivity in CuO{sub 2} planes

Journal Article · Fri Nov 01 04:00:00 EST 1996 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1007/BF00768448· OSTI ID:457218

Batista, C D; Aligia, A A ^[1]

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1. 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--
• Journal Information: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 3-4 Vol. 105; ISSN JLTPAC; ISSN 0022-2291
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COPPER OXIDES
HIGH-TC SUPERCONDUCTORS
SUPERCONDUCTIVITY
VALENCE