Does long-range antiferromagnetism help or inhibit superconductivity?
Abstract
We analyze the possible existence of a superconducting state in a background with long-range antiferromagnetism. We consider a generalized Hubbard model with nearest-neighbor correlated hopping in a square lattice. Near half filling, the model exhibits a d-wave-Bardeen-Cooper-Schrieffer (BCS) solution in the paramagnetic state. The superconducting solution would be enhanced by the antiferromagnetic background if the contribution of triplet pairs with d-wave symmetry and total momentum (pi, pi) could be neglected. However, we find that due to their contribution, the coexistence of superconductivity and long-range antiferromagnetism is ruled out for large values of the Coulomb repulsion U. Spin-density wave fluctuations (SDWF) do not change this result.
Cite
@article{arxiv.cond-mat/9805198,
title = {Does long-range antiferromagnetism help or inhibit superconductivity?},
author = {Liliana Arrachea and A. A. Aligia},
journal= {arXiv preprint arXiv:cond-mat/9805198},
year = {2009}
}
Comments
8 pages, 1 figure. Accepted for publication in Physica C