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

TL;DR

This paper investigates the phase transitions and coexistence of Mott insulator, antiferromagnetism, and d-wave superconductivity in layered organic conductors using Cellular Dynamical Mean Field Theory, revealing phase diagrams and making predictions.

Contribution

It provides a detailed phase diagram of layered organic conductors, showing the emergence of d-wave superconductivity between insulating and metallic phases, and offers insights into the mechanism of superconductivity.

Findings

d-wave superconductivity appears between antiferromagnetic insulator and metal

phase transitions are strongly first order

phase diagram offers insights into superconductivity mechanism

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 $t^{\prime}/t\geq 0.8$, 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.