Magnetism and d-wave superconductivity on the half-filled square lattice with frustration
| dc.creator | Nevidomskyy, Andriy H. | |
| dc.creator | Scheiber, Christian | |
| dc.creator | Senechal, David | |
| dc.creator | Tremblay, A. -M. S. | |
| dc.date | 2007-11-01 | |
| dc.date.accessioned | 2026-07-07T09:24:11Z | |
| dc.date.available | 2026-07-07T09:24:11Z | |
| dc.description | The role of frustration and interaction strength on the half-filled Hubbard model is studied on the square lattice with nearest and next-nearest neighbour hoppings t and t' using the Variational Cluster Approximation (VCA). At half-filling, we find two phases with long-range antiferromagnetic (AF) order: the usual Neel phase, stable at small frustration t'/t, and the so-called collinear (or super-antiferromagnet) phase with ordering wave-vector $(π,0)$ or $(0,π)$, stable for large frustration. These are separated by a phase with no detectable long-range magnetic order. We also find the d-wave superconducting (SC) phase ($d_{x^2-y^2}$), which is favoured by frustration if it is not too large. Intriguingly, there is a broad region of coexistence where both AF and SC order parameters have non-zero values. In addition, the physics of the metal-insulator transition in the normal state is analyzed. The results obtained with the help of the VCA method are compared with the large-U expansion of the Hubbard model and known results for the frustrated J1-J2 Heisenberg model. These results are relevant for pressure studies of undoped parents of the high-temperature superconductors: we predict that an insulator to d-wave SC transition may appear under pressure. | |
| dc.description | 12 pages, 10 figures | |
| dc.identifier | https://arxiv.org/abs/0711.0214 | |
| dc.identifier | http://arxiv.org/abs/0711.0214 | |
| dc.identifier | Phys. Rev. B 77, 064427 (2008) | |
| dc.identifier | doi:10.1103/PhysRevB.77.064427 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/156003 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.subject | Superconductivity | |
| dc.title | Magnetism and d-wave superconductivity on the half-filled square lattice with frustration | |
| dc.type | text |