Two-dimensional superconductivity in the layered organic superconductor κH-(DMEDO-TSeF)2[Au(CN)4](THF) with thick dielectric insulating layers
Tadashi Kawamoto, Takehiko Mori, Yamaguchi Takahide, Taichi Terashima, Shinya Uji, Takashi Shirahata, Tatsuro Imakubo
DOI 10.1103/PhysRevB.85.014504 · Physical Review B
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Abstract
We have systematically investigated the resistive superconducting transition in the layered organic superconductor κH-(DMEDO-TSeF)2[Au(CN)4](THF) [where DMEDO-TSeF is dimethyl(ethylenedioxy)tetraselenafulvalene and THF is tetrahydrofuran], which consists of two crystallographically independent conducting layers and one independent thick dielectric insulating layer. Applying a slight pressure of up to 0.35 GPa suppresses the superconducting phase. The angular dependence of the upper critical field and the short interlayer coherence length indicate that the present compound is a highly two-dimensional superconductor. The upper critical field parallel to the conducting layers exceeds the Pauli paramagnetic limit. These superconducting properties are consistent with the crystal structure in which the superconducting layers are well separated by a thick anion insulating layer.
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. | 4.4 | Pressure unresolved | midpoint |
| (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 unresolved | 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. | 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. | 2.2 | Pressure not reported | midpoint |
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