Many-body effect on the superconducting transition temperature in layered organic superconductors
Tadashi Kawamoto, Takehiko Mori
DOI 10.1103/PhysRevB.74.212502 · Physical Review B
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Abstract
We have calculated bare cyclotron masses of layered organic superconductors, κ-type bis(ethylenedithio)tetrathiafulvalene (ET) and bis(ethylenedithio)tetraselenafulvalene (BETS) salts, in which the effective cyclotron masses have been determined by quantum oscillations. The higher superconducting transition temperature (Tc) materials show the larger ratios of the observed to the bare cyclotron masses. This indicates that the mass enhancement, i.e., strong many-body effect is quite important for a high-Tc organic superconductor. The κ-type BETS salts need a stronger many-body interaction than the ET salts to be a superconductor, and the magnetic exchange interaction with magnetic anions realizes this requirement.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κ-(ET)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.4 | Pressure not reported | unknown |
| κ-(ET)2Cu[N(CN)2]Br Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.6 | Pressure not reported | unknown |
| κ-(ET)2I3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.6 | Pressure not reported | unknown |
| κ-(BETS)2FeBr4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.1 | Pressure not reported | unknown |
| κ-(BETS)2FeCl4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.1 | Pressure not reported | unknown |
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