Fermi surface and in-plane anisotropy of the layered organic superconductor κL-(DMEDO-TSeF)2[Au(CN)4](THF) with domain structures
Tadashi Kawamoto, Takehiko Mori, Yamaguchi Takahide, Shinya Uji, David Graf, James S. Brooks, Takashi Shirahata, Megumi Kibune, Hiroko Yoshino, Tatsuro Imakubo
DOI 10.1103/PhysRevB.83.012505 · Physical Review B
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Abstract
The Fermi surface of the layered organic superconductor κL-(DMEDO-TSeF)2[Au(CN)4](THF) has been investigated, where DMEDO-TSeF is dimethyl (ethylenedioxy) tetraselenafulvalene. Band-structure calculations show that the fundamental Fermi surface is not circular, but elliptical with an eccentricity of 0.76, leading to a large orbital overlap in the extended Brillouin zone. This symmetry is lowered by a structural phase transition at 209 K at which domains form. The magnetic breakdown orbit is observed in the Shubnikov–de Haas oscillations under the low-field region, consistent with the small energy gap at the zone boundary. The observation of the Shubnikov–de Haas effect shows that the present compound has a clean electronic system despite the domain structures.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κL-(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 |
| κH-(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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