Abstract
We report on de Haas-van Alphen (dHvA) oscillations observed in the mixed state of the organic superconductor β-(BEDT-TTF) 2 SF 5 CH 2 CF 2 SO 3 (BEDT-TTF stands for bisethylenedithio-tetrathiafulvalene) utilizing the field-modulation technique and torque magnetometry. At low temperatures (30 mK), the dHvA signal persists down to 1.4 T well below the upper critical field B c 2 3.6 T. Contrary to most theoretical predictions and previous experimental findings, no additional damping of the dHvA-oscillation amplitude, but a reduced damping of the dHvA signal is found. This highly unusual effect might indicate a reduced quasiparticle scattering rate or an additional oscillatory contribution in the superconducting state.
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