Author/Authors :
Wosnitza، نويسنده , , J. and Wanka، نويسنده , , S. and Qualls، نويسنده , , J.S. and Brooks، نويسنده , , J.S. and Mielke، نويسنده , , C.H. and Harrison، نويسنده , , N. and Schlueter، نويسنده , , J.A. and Williamsd، نويسنده , , J.M. and Nixon، نويسنده , , P.G. and Winter، نويسنده , , R.W. and Gard، نويسنده , , G.L.، نويسنده ,
Abstract :
We present a detailed Fermi-surface (FS) investigation of the quasi two-dimensional (2D) organic superconductor (Tc = 4.5 K) β″-(ET)2SF5CH2CF2SO3. In line with previous investigations, de Haas-van Alphen measurements in pulsed fields up to 60 T show a single oscillation frequency, F0 = 200 T. which corresponds to a FS size of about 5% of the first Brillouin zone. Angular dependent magnetoresistance oscillations (AMROs) are utilized for the exact determination of the in-plane FS, which is found to be a strongly elongated ellipsoid with an axes ratio of about 1:9. Transport measurements in static fields up to 33 T show an unusual temperature dependence of the Shubnikov-de Haas (SdH) signal, i.e., a decrease of the SdH amplitude with decreasing temperature.
