Electron states and Fermi surfaces in the organic superconductor κ-(BEDT-TTF)2 Cu[N(CN)2 ]Br
W. Y. Ching, Yong-Nian Xu, Y. C. Jean, Y. Lou
DOI 10.1103/PhysRevB.55.2780 · Physical Review B
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Abstract
The electronic structure and the Fermi surfaces of the organic superconductor κ-(BEDT-TTF)2 Cu[N(CN)2 ]Br are elucidated by first-principles calculations. The results show very narrow bands, high state density at the Fermi level, and a small band effective mass of 0.28m0 for the closed hole orbit. The topological features of the Fermi surfaces with multiple sheets are more complicated than that of κ-(BEDT-TTF)2 Cu(NCS)2 . Fermi electron distribution on the central C=C double bond reveals the nonequivalency of the two central C atoms.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κ-(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 unresolved | 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. | 10.4 | Pressure not reported | unknown |
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