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

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

2001-10-17

arxiv.org/abs/cond-mat/0110347v2

Phys. Rev. B 65, 132403 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

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

Scientific paper

10.1103/PhysRevB.65.132403

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.

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