Superconductivity in the two-dimensional t-J model

E. Dagotto; J. Riera

doi:10.1103/PhysRevB.46.12084

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Superconductivity in the two-dimensional t-J model

E. Dagotto, J. Riera

DOI 10.1103/PhysRevB.46.12084 · Physical Review B

T1

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Abstract

We study the t-J model in one and two dimensions. It is shown that superconducting correlations at large distances are enhanced at doping 〈n〉=1/2, and near the region of phase separation. Including a nearest-neighbor density-density repulsion term of strength V, and working at large V/t and J/t, our results can be explained using a previously discussed variational state where electrons are paired in singlets without cluster formation, in analogy to the attractive Hubbard model. We argue that the physics of the t-J-V model is basically independent of the dimension and that a smooth connection exists between small and large V/t. Then, we conjecture that the two-dimensional t-J model should also present strong superconducting correlations near the region of phase separation, at 〈n〉∼1/2. Numerical results both in one and two dimensions support our claims.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	120	Pressure not reported	unknown