Magnetotransport studies of the Fermi surface in the organic superconductor κ−(BEDT−TTF)2Cu[N(CN)2]Br
H. Weiss, M. V. Kartsovnik, W. Biberacher, E. Steep, E. Balthes, A. G. M. Jansen, K. Andres, N. D. Kushch
DOI 10.1103/PhysRevB.59.12370 · Physical Review B
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Abstract
Detailed measurements of the interlayer magnetotransport of the organic superconductor κ−bis(ethylenedithio)tetrathiafulvalene2Cu[N(CN)2]Br have been carried out at ambient pressure as well as under quasihydrostatic pressure up to 12 kbar. Shubnikov–de Haas oscillations at frequencies ≈150, 300, and 3900 T have been observed at various pressures. The rapid oscillations correspond to 100% of the Brillouin zone cross-section area, revealing a magnetic breakdown orbit in accordance with the theoretically predicted Fermi surface. However, the lower two frequencies do not agree with the theoretical predictions based on the room-temperature crystal structure. In order to interpret the discrepancy, we propose that the Fermi surface undergoes substantial topological changes at a superstructural transition below 200 K. The model appears to be fully consistent with the experimental observations.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (BEDT-TTF)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 |
| (BEDT-TTF)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 |
| (BEDT-TTF)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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