Does long-range antiferromagnetism help or inhibit superconductivity?

Details Does long-range antiferromagnetism help or inhibit superconductivity? Does long-range antiferromagnetism help or inhibit superconductivity?

1998-05-16

arxiv.org/abs/cond-mat/9805198v2

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 1 figure. Accepted for publication in Physica C

Scientific paper

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.

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