Measurement of the Energy Gap in an Organic Superconductor: Evidence for Extremely Strong Coupling
M. E. Hawley, K. E. Gray, B. D. Terris, H. H. Wang, K. D. Carlson, Jack M. Williams
DOI 10.1103/PhysRevLett.57.629 · Physical Review Letters
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Abstract
Point-contact tunneling is used to make what we believe to be the first measurement of a superconducting energy gap (Δ) in an organic superconductor. For a β−[bis(ethylenedithio)tetrathiafulvalene]2AuI2 single crystal, Δ shows consistent field and temperature dependences, but is more than 4 times larger than weak-coupling BCS value, implying extremely strong coupling. We speculate that very low-frequency modes may be responsible.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (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 | onset |
| (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 | onset |
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