Domain formation in the structural phase transition of the organic superconductor κL−(DMEDO−TSeF)2[Au(CN)4](THF)
Tadashi Kawamoto, Takehiko Mori, Toru Kakiuchi, Hiroshi Sawa, Takashi Shirahata, Megumi Kibune, Hiroko Yoshino, Tatsuro Imakubo
DOI 10.1103/PhysRevB.76.134517 · Physical Review B
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Abstract
Structural properties of the layered organic superconductor κL−(DMEDO−TSeF)2[Au(CN)4](THF) have been investigated, where DMEDO-TSeF is dimethyl(ethylenedithio)tetraselenafulvalene. We have found that a structural phase transition occurs at Td=209K, and that only the (00l) Bragg reflections split into two along the b* direction below Td. The low-temperature structure is composed of two monoclinic domains with the space group P21∕n11. The low-temperature monoclinic phase has two crystallographically independent dimers in a conducting layer, suggesting that the present compound potentially borders on the checkerboard-type charge ordered state, and has possibly different symmetry of superconductivity from the ordinary κ-type superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (DMEDO-TSeF)2[Au(CN)4](THF) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure not reported | onset |
| (DMEDO-TSeF)2[Au(CN)4](THF) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.8 | Pressure not reported | onset |
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