de Haas-van Alphen studies and Fermi surface properties of organic superconductors (ET)[sub 2]X

• Main Authors: Wosnitza, J. (Karlsruhe Univ. (T.H.) (Germany). Physikalisches Inst.), Crabtree, G. W., Williams, J. M., Wang, H. H., Carlson, K. D., Geiser, U. (Argonne National Lab., IL (United States))
• Other Authors: United States. Department of Energy.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Argonne National Laboratory 1993
• Subjects: Iodine Compounds; Fermi Level; Drugs; Energy Levels; 360606 > Other Materials > Physical Properties > (1992-); Thiocyanates; Ammonium Compounds; Bromides; Antithyroid Drugs; Bedt-Ttf; Ammonium Thiocyanates; Mass; Physical Properties; Hormone Antagonists; Organic Sulfur Compounds; Mercury Compounds; Magnetization; Organic Compounds; De Haas-Van Alphen Effect; Organic Superconductors; Transition Element Compounds 360607* > Other Materials > Superconducting Properties > (1992-); Halogen Compounds; Superconductors; Effective Mass; Heterocyclic Compounds; Bromine Compounds; Copper Compounds; Iodine Bromides; Halides; Carbonic Acid Derivatives; 36 Materials Science; Carbonic acid
• Online Access: https://digital.library.unt.edu/ark:/67531/metadc1206332/

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.