Antiferromagnetism and Superconductivity in Layered Organic Conductors: Variational Cluster Approach
P. Sahebsara, D. Sénéchal
DOI 10.1103/PhysRevLett.97.257004 · Physical Review Letters
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Abstract
The κ−(ET)2X layered conductors (where ET stands for BEDT-TTF) are studied within the dimer model as a function of the diagonal hopping t′ and Hubbard repulsion U. Antiferromagnetism and d-wave superconductivity are investigated at zero temperature using variational cluster perturbation theory (VCPT). For large U, Néel antiferromagnetism exists for t′<tc2′, with tc2′∼0.9. For fixed t′, as U is decreased (or pressure increased), a dx2−y2 superconducting phase appears. When U is decreased further, then a dxy order takes over. There is a critical value of tc1′∼0.8 of t′ beyond which the AF and dSC phases are separated by the Mott disordered phase.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κ-(ET)2Cu[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 |
| κ-(ET)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure unresolved | onset |
| κ-(ET)2Cu[N(CN)2]Br Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure unresolved | onset |
| 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 |
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