Pressure-induced superconductivity in the antiferromagnet κ−(ET)2CF3SO3 with quasi-one-dimensional triangular spin lattice
Hiroshi Ito, Takayuki Asai, Yasuhiro Shimizu, Hiromi Hayama, Yukihiro Yoshida, Gunzi Saito
DOI 10.1103/PhysRevB.94.020503 · Physical Review B
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Abstract
We report an antiferromagnetic (AF) ordering at ambient pressure and a superconducting transition under pressure for κ−(ET)2CF3SO3 [ET=bis(ethylenedithio)tetrathiafulvalene], which has a two-dimensional electronic system with quasi-one-dimensional triangular spin lattice. At ambient pressure, AF ordering was detected at TN=2.5K by H1 NMR, subsequent to two structural phase transitions at 230 and 190 K. Under hydrostatic pressures, metallic behavior appeared above ∼1.1 GPa, and a superconducting transition (maximum onset Tc=4.8K at ∼1.3 GPa) was observed up to 2.2 GPa. Superconductivity was also found under c-axis strain, which reduced t′/t, but was absent under b-axis strain which increased t′/t.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (ET)2CF3SO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.8 | 1.3 GPa | onset |
| (ET)2CF3SO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.8 | 1.9 GPa | onset |
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