Abstract
We report on Shubnikov–de Haas (SdH) and de Haas–van Alphen (dHvA) results for the highly two-dimensional (2D) organic superconductors κ-(ET) 2I 3 ( T c=3.5 K) and β″-(ET) 2SF 5CH 2CF 2SO 3 ( T c=4.4 K). The SdH oscillations of both materials show an apparent deviation from the well-understood 2D dHvA signal at low temperatures and high magnetic fields. For κ-(ET) 2I 3, the mechanism leading to this behavior still needs to be clarified. For β″-(ET) 2SF 5CH 2CF 2SO 3, an anomalous steady background part of the magnetoresistance seems to account for the observed discrepancies.
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