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TT: Tiefe Temperaturen

TT 30: Postersitzung IV: Kritische Ph
änomene, Quantenstörstellen, niederdimensionale Systeme

TT 30.26: Poster

Thursday, March 11, 2004, 14:30–19:00, Poster A

Magnetic and transport properties of the new organic conductor (BEDT-TTF)₂(B₁₂H₁₂)(CH₂Cl₂) — •Belal Salameh¹, Dieter Schweitzer¹, Christof Schneck², Ioannis Tiritiris², and Thomas Schleid² — ¹3.Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart — ²Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70550 Stuttgart

We performed detailed electrical transport, SQUID and ESR measurements on three new synthesized organic conductors based on the (BEDT-TTF) donor and (B₁₂H₁₂)⁻² anions. From the ESR line width (1.7, 13, 45 Gauss) and the conductivity measurements it is clear that three different phases were obtained by electrochemical crystallization. The structure of one phase could be solved yet giving a stoichiometry of (BEDT-TTF)₂(B₁₂H₁₂)(CH₂Cl₂). The unit cell is triclinic with P-1 symmetry and the lattice constants are: 8.296Å, 11.498Å, 12.386Å, 72.73^∘, 85.93^∘, 82.09^∘. Electronically this material is 1:1 salt (donor (+2) acceptor (-2) ratio),the dc conductivity at room temperature equlas 0.004 (Ω cm)⁻¹. The three phases show semiconducting behaviour with relatively small energy gaps. ESR, SQUID and dc resistivity measurements will be discussed.