Dynamics at T -> 0 in the half-integer isotropic high spin molecules

Abstract

We investigate the dynamical spin-spin auto-correlation function of the isotropic high spin molecules CrCu${}_6$ (S=9/2), CrNi${}_6$ (S=15/2) and CrMn${}_6$ (S=27/2), using magnetization, $\mu$SR and NMR measurements. We find that the field autocorrelation time $\tau$ of the molecule's spin at zero and low fields is nearly temperature independent as $T\to 50$ mK. The high temperatures $\tau$ is very different between the molecules. Surprisingly, it is identical ($\sim$ 10 nsec) at low temperature. This suggests that $\tau$ is governed by hyperfine interactions.

5 pages, 5 figures. To be published in PRB Breif Report (March 2002)

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