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Phys Rev Lett. 2000 Dec 18;85(25):5420-3.

Mott transition, antiferromagnetism, and unconventional superconductivity in layered organic superconductors.

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1
Laboratoire de Physique des Solides (CNRS, U.R.A.2), Université de Paris-sud, Bâtiment 510, 91405 Orsay, France.

Abstract

The phase diagram of the organic superconductor kappa-(ET)2Cu[N(CN)2]Cl has been accurately measured from 1H NMR and ac susceptibility techniques under helium gas pressure. The domains of stability of antiferromagnetic and superconducting orders in the pressure vs temperature plane have been determined. Both phases overlap through a first-order boundary that separates two regions of inhomogeneous phase coexistence. The boundary curve merges with the first-order line of the metal-insulator transition which ends with a critical point at higher temperature. The whole phase diagram features a point-like region where metallic, insulating, antiferromagnetic, and non-s-wave superconducting phases all meet.

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