Experimental Estimates of Dephasing Time in Molecular Magnets

Details Experimental Estimates of Dephasing Time in Molecular Magnets Experimental Estimates of Dephasing Time in Molecular Magnets

2007-06-24

arxiv.org/abs/0706.3506v2

Phys. Rev. Lett. 98, 257204 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.98.257204

Muon spin relaxation measurements in isotropic molecular magnets (MM) with a spin value S ranging from 7/2 to 27/2 are used to determine the magnitude and origin of dephasing time $\tau_\phi$ of molecular magnets. It is found that $\tau_\phi$ ~ 10 nsec with no S or ligand dependence. This indicates a nuclear origin for the stochastic field. Since $\tau_\phi$ is a property of the environment, we argue that it is a number common to similar types of MM. Therefore, $\tau_\phi$ is shorter than the Zener and tunneling times of anisotropic MM such as Fe8 or Mn4 for standard laboratory sweep rates. Our findings call for a stochastic Landau-Zener theory in this particular case.

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