Origin of superconductivity in β′−(BEDT−TTF)2ICl2 under high pressure and in β−(BEDT−TTF)2X at atmospheric pressure
Hiroshi Kontani
DOI 10.1103/PhysRevB.67.180503 · Physical Review B
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Abstract
We present a theoretical study on the superconductivity in β′−(BEDT−TTF)2ICl2 at Tc=14.2K under high hydrostatic pressure, which was recently found by Taniguchi et al. and is the highest recorded for organic superconductors. Its electronic structure is well expressed by the anisotropic triangular lattice Hubbard model at half filling. In the present paper, we study this effective model by using the fluctuation-exchange approximation. In the obtained phase diagram, the superconductivity with dx2−y2 like symmetry is realized next to the antiferromagnetic insulating phase, as a result of the one-dimensional–two-dimensional crossover driven by the pressure. The obtained maximum Tc is 16–18 K. In addition, the superconductivity in β−(BEDT−TTF)2X is also understood in the same framework.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| β'-(BEDT-TTF)2ICl2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14.2 | 8.2 GPa | unknown |
| β'-(BEDT-TTF)2ICl2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18 | 8.2 GPa | unknown |
| β-(BEDT-TTF)2IBr2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.7 | Pressure unresolved | unknown |
| β-(BEDT-TTF)2AuI2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.8 | Pressure unresolved | unknown |
| β-(BEDT-TTF)2I3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure unresolved | unknown |
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