This work is supported by EPSRC (UK). NHMFL is supported by the U.S. Department of Energy (DoE), the National Science Foundation, and the State of Florida.The work at Argonne is sponsored by the DoE, Office of Basic Energy Sciences, Division of Materials Science under Contract No. W-31-109-ENG-38.
Physical Review Letters
Organic superconductors -- Effect of magnetization on, Organic superconductors -- Oscillations, Fermi surfaces
We show that Shubnikov–de Haas oscillations in the interlayer resistivity of the organic superconductor β″-(BEDT-TTF)₂SF₅CH₂CF₂SO₃ become very pronounced in magnetic fields ~60T. The conductivity minima exhibit thermally activated behavior that can be explained simply by the presence of a Landau gap, with the quasi-one-dimensional Fermi surface sheets contributing negligibly to the conductivity. This observation, together with complete suppression of chemical potential oscillations, is consistent with an incommensurate nesting instability of the quasi-one-dimensional sheets.
Gard, Gary, Nam, M. -S., Ardavan, A., Symington, J. A., Singleton, N., Harrison, C. H., Mielke, J. A., Schlueter, J. A., and Winter, R. W. (2001) Thermal Activation between Landau Levels in the Organic Superconductor β″-(BEDT-TTF)₂SF₅CH₂CF₂SO₃. Physical Review Letters, 87, 11700-1.