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Berlin 2005 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 30: POSTER: Chemical physics

CPP 30.64: Poster

Tuesday, March 8, 2005, 16:30–18:30, Poster TU D

Anisotropy of electron spin diffusion in organic quasi-1D-conductors — •Armin Warth, David Saez de Jauregui, Stefan Matejcek, and Elmar Dormann — Physikalisches Institut, Universität Karlsruhe(TH),

The organic conductors (Fluoranthen)2PF6 and (Perylen)2AsF6 × 2/3 THF belong to the family of the so called arene radical cation salts and provide good model systems for the investigating the one-dimensional electron dynamics. Like other representatives of the organic quasi-1D-conductors a Peierls-transition can be observed in both conductors but at different temperatures.
Using X-band-pulse-ESR techniques with optimized static field gradients the electron spin diffusion was examined for different orientations and a broad temperature regime below and above the semiconductor-metal phase transition. These analyzes were focused on the determination of the electron spin motion perpendicular to the molecular stacking axis a, where the diffusion seems to be dominated by a conduction electron hopping process.
The results show the highly anisotropic character of the systems comparing parallel and perpendicular to stack diffusion. By irradiating a fluoranthen crystals with high energetic protons, the concentration of localized paramagnetic defects could be increased and the anisotropy decreased by about two orders of magnitude.

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