Competition between organic superconductivity and a displacive structural modulation in the molecular stacks in bis(ethylenedithio) tetrathiafulvalene perrhenate, (BEDT-TTF)2ReO4
S. Ravy, R. Moret, J. P. Pouget, R. Comes, S. S. P. Parkin
DOI 10.1103/PhysRevB.33.2049 · Physical Review B
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Abstract
The pressure-induced organic superconductor bis(ethylenedithio) tetrathiafulvalene perrhenate, (BEDT-TTF)2ReO4, is shown to undergo a first-order structural phase transition with an associated metal-to-insulator transition near T=77 K at ambient pressure. Superstructure reflections with reduced wave vectors q=((1/2),0,(1/2)) are found using single-crystal x-ray diffraction. Evidence is presented that these are not associated with a change of the anion ordering but result from a displacive structural modulation, which most probabably involves both the ReO4− anion and BEDT-TTF molecular sublattices.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (BEDT-TTF)2ReO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.5 | 0.4 GPa | unknown |
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