Mott Transition, Antiferromagnetism, and d-wave Superconductivity in Two-Dimensional Organic Conductors

Abstract

We study the Mott transition, antiferromagnetism and superconductivity in layered organic conductors using Cellular Dynamical Mean Field Theory for the frustrated Hubbard model. A d-wave superconducting phase appears between an antiferromagnetic insulator and a metal for $t^{\prime }/t=0.3-0.7$, or between a nonmagnetic Mott insulator (spin liquid) and a metal for $t^{\prime }/t\ge 0.8$, in agreement with experiments on layered organic conductors including $\kappa$-(ET)${}_2$Cu${}_2$(CN)${}_3$. These phases are separated by a strong first order transition. The phase diagram gives much insight into the mechanism for d-wave superconductivity. Two predictions are made.

5 pages, 4 figures

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