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

Zaher Salman·Amit Keren·Philippe Mendels·Valerie Marvaud·Ariane Scuiller·Michel Verdaguer·James S. Lord·Chris Baines
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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, $μ$SR and NMR measurements. We find that the field autocorrelation time $τ$ of the molecule's spin at zero and low fields is nearly temperature independent as $T\to 50$ mK. The high temperatures $τ$ is very different between the molecules. Surprisingly, it is identical ($\sim$ 10 nsec) at low temperature. This suggests that $τ$ is governed by hyperfine interactions.

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Zaher Salman, Amit Keren, Philippe Mendels, Valerie Marvaud, Ariane Scuiller, Michel Verdaguer, James S. Lord, Chris Baines. 2002-01-09. Dynamics at T -> 0 in the half-integer isotropic high spin molecules. https://doi.org/10.1103/physrevb.65.132403

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