CHARACTERIZATION OF THE FERMI-SURFACE OF THE ORGANIC SUPERCONDUCTOR BETA''-(ET)(2)SF5CH2CF2SO3 BY MEASUREMENTS OF HAAS,SHUBNIKOV,DE AND ANGLE-DEPENDENT MAGNETORESISTANCE OSCILLATIONS AND BY ELECTRONIC BAND-STRUCTURE CALCULATIONS
D. Beckmann et al., CHARACTERIZATION OF THE FERMI-SURFACE OF THE ORGANIC SUPERCONDUCTOR BETA''-(ET)(2)SF5CH2CF2SO3 BY MEASUREMENTS OF HAAS,SHUBNIKOV,DE AND ANGLE-DEPENDENT MAGNETORESISTANCE OSCILLATIONS AND BY ELECTRONIC BAND-STRUCTURE CALCULATIONS, EUROPEAN PHYSICAL JOURNAL B, 1(3), 1998, pp. 295-300
The electronic structure of the quasi two-dimensional (2D) organic sup
erconductor beta ''-(ET)(2)SF5CH2CF2SO3 was examined by measuring Shub
nikov-de Haas (SdH) and angle-dependent magnetoresistance (AMRO) oscil
lations and by comparing with electronic band-structure calculations.
The SdH oscillation frequencies follow the 1/cos theta angular depende
nce expected for a 2D Fermi surface (FS), and the observed fundamental
frequency shows that the 2D FS is 5% of the first Brillouin zone in s
ize. The AMRO data indicate that the shape of the 2D FS is significant
ly non-circular. The calculated electronic structure has a 2D FS in ge
neral agreement with experiment. From the temperature and angular depe
ndence of the SdH amplitude, the cyclotron and band effective masses w
ere estimated to be m(c) = (1.9 +/- 0.05)m(e) and m(b) = (3.90+/-0.05)
m(e)/g, where g is the conduction electron g factor and m(e) the free
electron mass. The band effective mass is estimated to be m(b)' =1.07
m(e) from the calculated electronic band structure.