Berlin 2005 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 16: Posters Correlated Electrons, Measuring Devices, Cryotechnique
TT 16.62: Poster
Samstag, 5. März 2005, 11:00–16:30, Poster TU C
Electron Spin Resonance and Transport Measurements on the neat Organic Superconductor Θ-(BEDT-TTF)2I3 — •Belal Salameh, Axel Nothardt, Anja Much, and Dieter Schweitzer — 3.Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
On crystals of the neat organic superconductor Θ-(BEDT-TTF)2I3 transport and magnetic properties have been investigated by means of ESR, SQUID and dc measurements. From the dc resistivity and susceptibility measurements this material has a typical metallic behaviour from room temperature down to the superconducting transition temperature (Tc = 3.6 K). The room temperature resistivities parallel and perpendicular to the conduction plane are typically 0.04 and 20 Ω ·cm respectively. The resistivities decrease about three orders of magnitude at 4.2 K. The ESR linewidth ranges from about 60 to 80 G at room temperature and decreases with decreasing temperature down to about 8 G at 20 K. Below 20 K the linewidth increases again slightly probably due to magnetic interactions. At room temperature our crystals exhibit Dysonian line shape when the microwave magnetic field is applied perpendicular to the conduction plane and a Lorentzian lineshape when the microwave magnetic field is parallel to the conduction plane. The Lorentzian line is gradually converted to a Dysonian shape with decreasing temperature below about 250 K due to a significant decrease in the skin depth.