Abstract
We present de Haas-van Alphen (dHvA) measurements of the isostructural quasi-two-dimensional (quasi-2D) organic superconductors β-(BEDT-TTF) 2 IBr 2 and β H -(BEDT-TTF) 2 I 3 with superconducting transition temperatures of T c ≃ 2.5 K and T c ≃ 7 K, respectively. For both salts almost the same dHvA frequency and a beating behavior of the dHvA signal are found which reflect the similarity of the Fermi surface (FS) topology in both materials. The FS can be well described by a slightly corrugated quasi-2D cylinder. The corresponding overlap integral t⊥ between the highly conducting organic layers could be determined with high precision. t⊥ is larger for β H -(BEDT-TTF) 2 I 3 although this salt has the larger interlayer distance. The effective cyclotron masses are very similar in both materials (m c 4 m e ). On the other hand, the observed spin-splitting zeros suggest a rather large difference and large absolute values of the conduction electron g-factor which seems to reflect the importance of electron-electron interactions in the β-phase salts.
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