U−J synergy effect for high-Tc superconductors
Liliana Arrachea, Dražen Zanchi
DOI 10.1103/PhysRevB.71.064519 · Physical Review B
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Abstract
Using the renormalization group with included self-energy effects and exact diagonalization of small clusters we investigate the ground-state phase diagram of a two-dimensional extended Hubbard model with nearest-neighbor exchange interaction J, in addition to the local Coulomb repulsion U. The main instabilities are antiferromagnetism close to half filling and dx2−y2 superconductivity in the doped system. We find that self-energy effects are fatal for superconductivity in the repulsive Hubbard model (i.e., J=0, U>0). The superconductivity is triggered by finite J. The combined action of J and U interactions provide a remarkably efficient, mechanism to enhance both dx2−y2 superconducting and antiferromagnetic correlations.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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