Roles of spin fluctuation and frustration in the superconductivity of β−(BDA-TTP)2X (X=SbF6,AsF6) under uniaxial compression
Hiroshi Ito, Tetsuo Ishihara, Hisaaki Tanaka, Shin-ichi Kuroda, Takeo Suzuki, Seiichiro Onari, Yukio Tanaka, Jun-ichi Yamada, Koichi Kikuchi
DOI 10.1103/PhysRevB.78.172506 · Physical Review B
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Abstract
β-type BDA-TTP [BDA-TTP=2,5-bis(1,3-dithian-2-ylidene)-1,3,4,6-tetrathiapentalene] salts possess high transition temperatures TC reaching 7 K among organic superconductors. TC of β−(BDA-TTP)2X (X=SbF6,AsF6) is studied by resistive measurements under uniaxial compression. TC once increases and takes a maximum under compression parallel to the donor stack while it decreases under compression perpendicular to the donor stack. These results are in agreement with the half-filled Hubbard model on the triangular lattice in which the compression controls the spin fluctuation and frustration in the weak pressure region.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (BDA-TTP)2SbF6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.5 | Pressure not reported | midpoint |
| (BDA-TTP)2AsF6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.9 | Pressure not reported | midpoint |
| (BEDT-TTF)2ICl2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14.2 | 8.2 GPa | unknown |
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