de Haas-van Alphen studies and Fermi surface properties of organic superconductors (ET){sub 2}X
- Karlsruhe Univ. (T.H.) (Germany). Physikalisches Inst.
- Argonne National Lab., IL (United States)
de Haas-van Alphen (dHvA) measurements of organic superconductors (ET){sub 2}X, where ET stands for bis(ethylene)dithiotetrathiafulvalene (or BEDT-TTF) and X = IBr{sub 2}, (NH{sub 4})Hg(SCN){sub 4} and Cu(NCS){sub 2} are reported. The strong two-dimensionality of the Fermi surface (FS) is clearly seen by the perfect 1/cos({Theta})-behavior of the dHvA frequency. The distinctive kind of beating and the angular dependence of the dHvA signal in {beta}-(ET){sub 2}IBr{sub 2} gives clear evidence for a lightly corrugated structure of the FS. Due to the nearly cylinder-shape of the FS the bare band structure effective mass, m{sub b}, also shows a 1/cos({Theta})-dependence which is responsible for spin splitting zeros at certain angles. At these points, where the fundamental amplitude of the dHvA signal is vanishing, m{sub b} could exactly be determined and by comparison with the independently measured cyclotron effective mass the electron-phonon coupling constant could be estimated. 17 refs, 5 figs.
- Research Organization:
- Argonne National Lab., IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 10162019
- Report Number(s):
- ANL/MSD/CP--79640; CONF-9208132--13; ON: DE93015157
- Country of Publication:
- United States
- Language:
- English
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