Indications of Unconventional Superconductivity in Doped and Undoped Triangular Antiferromagnets

Details Indications of Unconventional Superconductivity in Doped and Undoped Triangular Antiferromagnets Indications of Unconventional Superconductivity in Doped and Undoped Triangular Antiferromagnets

1998-07-10

arxiv.org/abs/cond-mat/9807168v2

Phys. Rev. B 59, R713 (1999)

Physics

Condensed Matter

Superconductivity

4 pages, 6 figs, results for half-filled systems added, to be published in PRB January 99

Scientific paper

10.1103/PhysRevB.59.R713

The possibility of superconductivity in doped and undoped triangular antiferromagnets is discussed. Using the Bethe-Salpeter (B-S) equation, it is shown that the exchange of RPA paramagnons on a triangular lattice Hubbard model leads to strong pairing correlations at and near half-filling. The dominant states for this system correspond to d-wave singlet (even-frequency) and s-wave triplet (odd-frequency) pairing. Analytical techniques applied to the hole-doped t-J model yield similar results. A t_1-t_2 Hubbard model interpolating between square (t_1=0) and triangular (t_1=t_2) lattices has a tendency to only d-wave singlet pairing for t_1/t_2 <= 0.8. Experimental consequences for organic compounds $\kappa$-(BEDT-TTF)$_2$X are discussed.

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