Magnetism and d-wave superconductivity on the half-filled square lattice with frustration

Details Magnetism and d-wave superconductivity on the half-filled square lattice with frustration Magnetism and d-wave superconductivity on the half-filled square lattice with frustration

2007-11-01

arxiv.org/abs/0711.0214v1

Phys. Rev. B 77, 064427 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages, 10 figures

Scientific paper

10.1103/PhysRevB.77.064427

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 $(\pi,0)$ or $(0,\pi)$, 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.

Affiliated with

Also associated with

No associations

Rating

Magnetism and d-wave superconductivity on the half-filled square lattice with frustration does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Magnetism and d-wave superconductivity on the half-filled square lattice with frustration, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetism and d-wave superconductivity on the half-filled square lattice with frustration will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-437009