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We investigate the dynamical spin-spin auto-correlation function of theisotropic high spin molecules CrCu$_{6}$ (S=9/2), CrNi$_{6}$ (S=15/2) andCrMn$_{6}$ (S=27/2), using magnetization, $\mu$SR and NMR measurements. We findthat the field autocorrelation time $\tau$ of the molecule's spin at zero andlow fields is nearly temperature independent as $T\to 50$ mK. The hightemperatures $\tau$ is very different between the molecules. Surprisingly, itis identical ($\sim$ 10 nsec) at low temperature. This suggests that $\tau$ isgoverned by hyperfine interactions.Comment: 5 pages, 5 figures. To be published in PRB Breif Report (March 2002

physical review. b, condensed matter

Dynamics at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mo>→</mml:mo></mml:mrow></mml:mover></mml:mrow></mml:mrow><mml:mn>0</mml:mn></mml:math>in half-integer isotropic high-spin molecules

Dynamics atT→0in half-integer isotropic high-spin molecules