Shear-induced superconductivity in β-di[-Bis(ethylene- dithio)tetrathiafulvalene]triiodide [β-(BEDT-TTF)2I3]
J. E. Schirber, L. J. Azevedo, J. F. Kwak, E. L. Venturini, P. C. W. Leung, M. A. Beno, H. H. Wang, J. M. Williams
DOI 10.1103/PhysRevB.33.1987 · Physical Review B
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Abstract
We show that the high-Tc (8-K) superconducting state of β-(BEDT-TTF)2I3 [β-(C10H8S8)2 I3] is formed by a combination of shear stress and hydrostatic presure and cannot be accessed by presence alone. Also, measurements of the pressure dependence of Tc in the ambient-pressure superconductors β-(BEDT-TTF)2I3, β-(BEDT-TTF)2IBr2, and β-(BEDT-TTF)2AuI2 show a common pressure derivative of about 1 K/kbar, which is nearly an order of magnitude larger than that of any previously reported superconductor. We present a structural model which is consistent with these observations.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (BEDT-TTF)2I3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure not reported | onset |
| (BEDT-TTF)2I3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.5 | Pressure unresolved | onset |
| (BEDT-TTF)2IBr2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.8 | Pressure unresolved | onset |
| (BEDT-TTF)2AuI2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure unresolved | onset |
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