t−J model on the effective brick-wall lattice for the recently discovered high-temperature superconductor Ba2CuO3+δ
Zhan Wang, Sen Zhou, Weiqiang Chen, Fu-Chun Zhang
DOI 10.1103/PhysRevB.101.180509 · Physical Review B
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Abstract
Layered copper oxides have the highest superconducting transition temperatures at ambient pressure. Its mechanism remains a major challenge in condensed matter physics. The essential physics lying in two-dimensional copper-oxygen layers is well described by a single-band Hubbard model or its strong-coupling limit t−J model in a two-dimensional square lattice. The recently discovered high-temperature superconductor Ba2CuO3+δ with δ∼0.2 has a different crystal structure with a large portion of in-plane oxygen vacancies. We observe that an oxygen vacancy breaks the bond of its two neighboring copper atoms, and propose the ordered vacancies in Ba2CuO3+δ lead to an extended t−J model on an effective brick-wall lattice. For the nearest-neighbor hopping, the brick-wall model can be mapped onto the t−J model on a honeycomb lattice. Our theory explains the superconductivity of Ba2CuO3+δ at a high charge carrier density, and predicts a time-reversal symmetry-broken pairing state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba2CuO3+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 73 | Pressure not reported | unknown |
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