Indications of Unconventional Superconductivity in Doped and Undoped Triangular Antiferromagnets
Matthias Vojta, Elbio Dagotto
Abstract
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 t1-t2 Hubbard model interpolating between square (t1=0) and triangular (t1=t2) lattices has a tendency to only d-wave singlet pairing for t1/t2 <= 0.8. Experimental consequences for organic compounds κ-(BEDT-TTF)2X are discussed.
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