Angular dependence of the cyclotron effective mass in organic superconductors
J. Wosnitza, G. W. Crabtree, H. H. Wang, K. D. Carlson, M. D. Vashon, J. M. Williams
DOI 10.1103/PhysRevLett.67.263 · Physical Review Letters
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Abstract
We report measurements of the de Haas–van Alphen (dHvA) effect in the organic superconductors α-(BEDT-TTF)2(NH4)Hg(SCN)4 (Tc≊1 K) and κ-(BEDT-TTF)2Cu(NCS)2 (Tc≊10 K) in fields up to 15 T and temperatures down to 0.45 K. For the first time, we determine the angular dependence of the cyclotron effective mass mc, and the orientation of up to four spin-splitting zeros of the dHvA signal. The angular dependence of the amplitude of the dHvA oscillations is quantitatively explained, and the mass enhancement due to electron-phonon coupling is estimated.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| α-(BEDT-TTF)2(NH4)Hg(SCN)4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure not reported | unknown |
| κ-(BEDT-TTF)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure not reported | unknown |
| κ-(ET)2Cu[N(CN)2]Cl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12.8 | 0.03 GPa | unknown |
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