X-ray study of the incommensurate modulation of the organic superconductor β-di[bis(ethylenedithio)tetrathiafulvalene] tri-iodide
S. Ravy, J. P. Pouget, R. Moret, C. Lenoir
DOI 10.1103/PhysRevB.37.5113 · Physical Review B
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Abstract
An ambient-pressure x-ray study of the incommensurate phase of the organic superconductor β-di[bis(ethylenedithio)tetrathiafulvalene] tri-iodide, β-(BEDT-TTF)2I3 is presented. This phase appears at Tc=175 K (a temperature which is lower than that previously reported, ∼200 K), and is announced by quasi-isotropic structural fluctuations which have been followed until room temperature. Below Tc the incommensurate modulation is characterized not only by first-order satellite reflections, but also by higher-order satellites up to the fifth. Upon irradiation the temperature dependence of the first-order satellite intensity shows an anomalous decrease below about ∼125 K, which has been interpreted as due to the formation of unmodulated regions in the vicinity of irradiation defects. These results provide a clue for the understanding of the phase diagram of β-(BEDT-TTF)2I3 under pressure and of anomalies observed at ambient pressure in the low-temperature electrical conductivity of cycled or irradiated samples.
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. | 1.5 | Pressure unresolved | unknown |
| (BEDT-TTF)2I3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.4 | Pressure not reported | unknown |
| (BEDT-TTF)2I3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.1 | Pressure not reported | unknown |
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