Work at Karlsruhe was supported by the DFG. J.S.Q. was supported by Grant No. NSF-DMR-10427. We acknowledge the NSF, the state of Florida, and the U.S. Department of Energy for support of the National High Magnetic Field Laboratory.Work at Argonne National Laboratory was supported by the U.S. Dept. of Energy (Grant No. W-31-109-ENG-38). Work at Portland State University was supported by NSF (Grant No. Che-9904316) and the Petroleum Research Fund (ACS-PRF No. 34624-AC7).
Physical Review B
Organic superconductors, Magnetoresistance, Superconductivity
The magnetic-field, temperature, and angular dependence of the interlayer magnetoresistance of two different quasi-two-dimensional (2D) organic superconductors is reported. For k -BEDT-TTF)₂I₃, where BEDTTTF is bisethylenedithio-tetrathiafulvalene, we find a well-resolved peak in the angle-dependent magnetoresistance at Q590°(field parallel to the layers). This clear-cut proof for the coherent nature of the interlayer transport is absent for β″–(BEDT-TTF)₂SF₅CH₂CF₂SO₃. This and the nonmetallic behavior of the magnetoresistance suggest an incoherent quasiparticle motion for the latter 2D metal.
J. Wosnitza, J. Hagel, J.S. Qualls, J.S. Brooks, D. Schweitzer, J.A. Schlueter, U. Geiser, J. Mohtasham, R.W. Winter and G.L. Gard, "Coherent vs Incoherent Interlayer Transport in Layered Metals," Phys. Rev. B, 65, 180506 (2002).