(BEDT-TTF)+ 2J- 3: A Two-Dimensional Organic Metal

Bender, Klaus; Dietz, Klaus; Endres, H.; Helberg, H. W.; Hennig, Ingolf; Keller, Heimo J.; Schäfer, Herbert; Schweitzer, Dieter

doi:10.1080/00268948408072071

Cited by 175 publications

(64 citation statements)

References 4 publications

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“…The curves are similar to those measured on the pressed polycrystalline samples of α-(BEDT-TTF)2I3 [10]. But in contrast to the sharp decrease at 135 K in single crystals [11], the transition in our case and in the pressed samples is broadened and shifted to higher temperatures, obviously because of the fine grain crystal structure. This correspondsthough in a weaker form -to the known sharp phase transition of single crystalline α-(BEDT-TTF)2I3 at 135 K. Thus we suggest that the conductivity in unannealed films is governed by the α-phase.…”

Section: Resultssupporting

confidence: 62%

Microwave Conductivities of Polymer Films Doped with BEDT-TTF Polyiodides

et al. 1995

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Conducting reticulate doped polymeric films containing BEDT-TTF iodide crystalline networks have been annealed in order to transform the crystallites into crystal phases with metallic conductivity. The microwave conductivity of these films was measured before and after annealing. The temperature dependence of the conductivity changes dramatically with optimal annealing temperatures and times. This change in the behavior corresponds to the transformation of the a-phase into the superconducting a t-phase observed in (BEDT-TTF)2I3 single crystals.

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Section: Resultssupporting

confidence: 62%

Microwave Conductivities of Polymer Films Doped with BEDT-TTF Polyiodides

et al. 1995

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“…For long distances (small q), the electronic polarizability exceeds the ionic one, in spite of the small value of KTFdressed • The cut-off frequency ω0 can be determined experimentally, and is about 15-20 meV in the cuprates [19] and about 4 meV in the organic superconductors [15]. This is the frequency of the low optical phonons, such as the modes dominated by the barium (or yttrium) ions.…”

Section: A Self-consistent Treatment Of the Ionic And Electronic Polamentioning

confidence: 99%

The Primary Role of Ionic Polarizability in Exotic Superconductivity

Weger

1995

Acta Phys. Pol. A

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The ionic polarizability of organic metals and of high-Tc cuprates is very high while the density of conduction electrons is low. As a result, the ionic polarizability screens out the electronic polarizability for states very close to the Fermi surface. The cut-off is determined by the dispersion of the ionic polarizability. The electron-phonon matrix element is very large for the ionically screened states, and is the cut-off for the electronically screened states. Therefore, the McMillan coupling constant λ p hi s v e r y l a r g e a t v e r y low energies, and has a low energy cut-off. This model accounts for both normal and superconducting state anomalies in organic metals, as well as cuprates.

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“…Both types of Crystal. , can be easily distinguished by eye because a;>hase crystals have usually 8 plate-like shape while fj ;>hase crystals are canted rhombohedrons. In addition the room temperature ESR Unewidth of the conduction electrons can be used to discriminate unequivocal between both salts (70 to 110 Gauss for a -phase crystals a~d 20 to 25 Gauss for ,6;>hase crystals depending on the direction of the crystals…”

Section: Introductionmentioning

confidence: 99%