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

B. Kyung; A.-M. S. Tremblay

doi:10.1103/PhysRevLett.97.046402

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

B. Kyung, A.-M. S. Tremblay

DOI 10.1103/PhysRevLett.97.046402 · Physical Review Letters

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Abstract

We study the Mott transition, antiferromagnetism, and superconductivity in layered organic conductors using the 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′/t=0.3–0.7 or between a nonmagnetic Mott insulator (spin liquid) and a metal for t′/t≥0.8, in agreement with experiments on layered organic conductors including κ−(ET)2Cu2(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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
κ-(BEDT-TTF)2X Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
κ-(ET)2Cu2(CN)3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Cu[N(CN)2]Cl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Cu2(CN)3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.9	Pressure not reported	unknown
Cu[N(CN)2]Br Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	11.6	Pressure not reported	unknown
Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10.4	Pressure not reported	unknown