This work was supported by the DFG and by the TMR Program under Contract No. ERBFMGECT950077. The National High Magnetic Field Laboratory is supported by NSF, the state of Florida, and the U.S. Dept. of Energy. Work at Argonne National Laboratory was supported by the U.S. Dept. of Energy (W-31-109-ENG- 38). Work at Portland State University was supported by NSF (Che-9632815) and the Petroleum Research Fund (ACS-PRF # 31099-AC1).
Physical Review B
Organic superconductors, Fermi surfaces
de Haas-van Alphen measurements made on the organic metal β″-(ET)₂SF₅CH₂CF₂SO₃ reveal the existence of an ideal two-dimensional (2D) Fermi surface, but rather than having the conventional sawtooth wave form that is normally observed in all other 2D electron gases, instead, an ‘‘inverse sawtooth’’ wave form is observed, which is to be expected when the chemical potential is pinned at a constant value. While this proves the existence of the theoretically predicted quasi-one-dimensional band, it further implies that this band has an exceptionally large density of states.
Wosnitza, J., Wanka, S., Hagel, J., Balthes, E., Harrison, N., Schlueter, J. A., Kini, A. M., Geiser, U., Mohtasham, J., Winter, R. W., Gard, G. L. (2000). Two-dimensional Fermi liquid with fixed chemical potential. Physical Review B, 61, 7384.