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

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 se...

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Bibliographic Details
Main Authors: Wosnitza, J. . Physikalisches Inst.), Crabtree, G.W., Williams, J.M., Wang, H.H., Carlson, K.D., Geiser, U. )
Language:unknown
Published: 2008
Subjects:
36 MATERIALS SCIENCE
BEDT-TTF
PHYSICAL PROPERTIES
ORGANIC SUPERCONDUCTORS
AMMONIUM THIOCYANATES
COPPER COMPOUNDS
DE HAAS-VAN ALPHEN EFFECT
EFFECTIVE MASS
FERMI LEVEL
IODINE BROMIDES
MAGNETIZATION
MERCURY COMPOUNDS
THIOCYANATES
AMMONIUM COMPOUNDS
ANTITHYROID DRUGS
BROMIDES
BROMINE COMPOUNDS
CARBONIC ACID DERIVATIVES
DRUGS
ENERGY LEVELS
HALIDES
HALOGEN COMPOUNDS
HETEROCYCLIC COMPOUNDS
HORMONE ANTAGONISTS
IODINE COMPOUNDS
MASS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
Carbonic acid
Online Access:http://www.osti.gov/servlets/purl/6342515
https://www.osti.gov/biblio/6342515
Description
Summary: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.

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