Regensburg 2004 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 3: Magnetic Resonance

CPP 3.5: Talk

Monday, March 8, 2004, 11:00–11:15, H 38

Spatially resolved and integral measurements of the electron spin diffusion properties of an organic quasi-1d conductor — •Malte Drescher, David Saez de Jauregui, and Elmar Dormann — Physikalisches Institut, Universit"t Karlsruhe (TH), D-76128 Karlsruhe

The radical cation salt (Fluoranthen)₂PF₆ is an organic quasi-1d conductor showing a Peierls transition at T_P=186 K. X-band-pulse-ESR measurements were performed both below and above the semiconductor-metall phase transition. Using the static field gradient spin echo method the electron spin diffusion was analyzed.

Special attention was payed to the electron spin diffusion coefficient perpendicular to the molecular stacking axes a, because in this direction diffusion seems mainly caused by a conducting electron hopping process.

The electron spin diffusion is affected by the density of defects which can be influenced by irradiating the crystals with high-energetic protons (E_P=25 MeV). In order to unravel these effects a (Fluoranthen)₂PF₆ crystal was irradiated homogeneously as well as through a periodic grid to result in a stripy pattern. We show a temperature dependent spatially resolved ESR-analysis of this No-dqzebra-likeNo-dq sample.