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Titolo:
On the stoichiometry of the organic metal bis(ethylenedioxy)-tetrathiafulvalene chloride
Autore:
Beckmann, D; Wanka, S; Wosnitza, J; Goll, G; Drehmann, B; Balthes, E; Schweitzer, D; Strunz, W;
Indirizzi:
Univ Karlsruhe, Inst Phys, D-76128 Karlsruhe, Germany Univ Karlsruhe Karlsruhe Germany D-76128 hys, D-76128 Karlsruhe, Germany Maxrenoble,Inst Festkorperforsch, Grenoble High Magnet Field Lab, F-38042 G Max Planck Inst Festkorperforsch Grenoble France F-38042 Lab, F-38042 G CNRS, F-38042 Grenoble, France CNRS Grenoble France F-38042CNRS, F-38042 Grenoble, France Univ Stuttgart, Inst Phys 3, D-70550 Stuttgart, Germany Univ Stuttgart Stuttgart Germany D-70550 s 3, D-70550 Stuttgart, Germany Univ Heidelberg, Inst Anorgan Chem, D-69120 Heidelberg, Germany Univ Heidelberg Heidelberg Germany D-69120 , D-69120 Heidelberg, Germany
Titolo Testata:
EUROPEAN PHYSICAL JOURNAL B
fascicolo: 3, volume: 6, anno: 1998,
pagine: 329 - 333
SICI:
1434-6028(199812)6:3<329:OTSOTO>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
QUANTUM OSCILLATIONS; AMBIENT PRESSURE; RADICAL SALTS; BEDT-TTF; SUPERCONDUCTOR; BIS(ETHYLENEDIOXY)TETRATHIAFULVALENE; MAGNETORESISTANCE; OXYGEN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Beckmann, D Univ Karlsruhe, Inst Phys, Kaiserstr 12, D-76128 Karlsruhe, Germany Univ Karlsruhe Kaiserstr 12 Karlsruhe Germany D-76128 Germany
Citazione:
D. Beckmann et al., "On the stoichiometry of the organic metal bis(ethylenedioxy)-tetrathiafulvalene chloride", EUR PHY J B, 6(3), 1998, pp. 329-333

Abstract

We report on Shubnikov-de Haas and de Haas-van Alphen measurements of an organic metal based on the molecular donor bis(ethylenedioxy)-tetrathiavulvalene (= BEDO-TTF) and the anion Cl<SUP>-</SUP> with H<INF>2</INF>O molecules. The observed single oscillation frequency perfectly follows the two-dimensional dependence F = F<INF>0</INF>/cos Theta with F<INF>0</INF> = (4890 +/- 20) T. The Fermi-surface area of similar to 50% of the first Brillouin zone proves a quarter-filled band, i.e., a 2:1 stoichiometry of the BEDO-TTFdonor with respect to the anion. The apparent discrepancy to X-ray data which give a 1:1<SUP></SUP> ratio between BEDO-TTF and Cl<SUP>-</SUP> is understood by replacement of H<INF>2</INF>O molecules with (H<INF>3</INF>O)<SUP>+</SUP> ions. The proposed stoichiometry therefore is (BEDO-TTF)<INF>2</INF><SUP>+</SUP> (H<INF>5</INF>O<INF>2</INF>)<SUP>+</SUP>(Cl<SUP>-</SUP>)<INF>2</INF>. The cyclotron effective mass is m<INF>c</INF> (1.54 +/- 0.05)m<INF>e</INF>/cos Theta when deduced from the temperature dependence of the fundamental oscillation amplitude, but strongly reduced when extracted from higher harmonics. This and the strong harmonic content of the oscillations signals an influence of the two-dimensional electronic structure and can by qualitatively understood by applying the concept of magnetic interaction to the effect of the oscillatory chemical potential.

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Documento generato il 23/09/20 alle ore 16:09:05