Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-04-26
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 6 figures, Revtex
Scientific paper
10.1103/PhysRevLett.85.5420
The phase diagram of the layered organic superconductor $\kappa$-(ET)$_{2}$Cu[N(CN)$_{2}$]Cl has been accurately measured from a combination of $^{1}$H NMR and AC susceptibility techniques under helium gas pressure. The domains of stability of antiferromagnetic and superconducting long-range orders in the pressure {\it 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 is found to merge with another first order line related to the metal-insulator transition in the paramagnetic region. This transition is found to evolve into a crossover regime above 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.
Batail Patrick
Bourbonnais Claude
Brown Shanique
Fourmigue M.
Jerome Denis
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