Münster 1997 – wissenschaftliches Programm

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AM: Magnetismus

AM 18: Postersitzung Fürstenberghaus

AM 18.44: Poster

Mittwoch, 19. März 1997, 14:30–17:30, F"u

Macroscopic quantum tunneling in organo metallic crystals — •T. Ohm and C. Paulsen — Centre de recherches sur les Tres Basses Temperatures, CNRS Grenoble

Magnetic susceptibility and relaxation measurements on organo-metallic samples at very low temperatures are presented. The organo-metallic samples contain magnetic clusters which are embedded in the non-magnetic organic matrix. These samples are similar in that the clusters show a high net spin and strong anisotropy. At high temperature the change of magnetization can be explained by a thermal activated inversion of the mesoscopic cluster-spin. At low temperatures (≥ 50 mK) below the blocking temperature alternatives explanations like high-spin-tunneling or macroscopic quantum tunneling have to be taken into account to explain the relaxation dynamic.