Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 7: Superconductivity & Solids At Low Temperature - Poster Session

TT 7.68: Poster

Montag, 27. März 2006, 14:00–17:45, P1

Dielectric polarisation echos on partially deuterated organic glassformers — •Marek Bartkowiak¹, Masoomeh Bazrafshan¹, Herbert Zimmermann², Andreas Fleischmann¹, and Christian Enss¹ — ¹Kichhoff-Institut für Physik, Universität Heidelberg, Germany — ²Max-Planck-Institut für medizinische Forschung, Heidelberg, Germany

The properties of amorphous solids are governed by tunnelling systems, at temperatures below a few Kelvin. Ever since tunnelling processes were considered to describe the anomalous low temperature behaviour of glasses the question about their microscopic origin is posed. Newly discovered magnetic field effects in the dielectric properties of glasses containing atoms with nuclear quadrupole moments have opened a path to a possible microscopic theory of tunnelling processes in amorphous materials. Recent studies of the magnetic field dependence of polarisation echos generated in partially deuterated glycerol have provided first insights regarding the tunnelling motion of glycerol molecules. We have now extended our investigations towards other organic glassformers. We present first data and discuss possible conclusion about the microscopic nature of tunnelling systems in these materials.