Experimental Estimates of Dephasing Time in Molecular Magnets

Abstract

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 ${\tau }_{\varphi }$ of molecular magnets. It is found that ${\tau }_{\varphi }$ ~ 10 nsec with no S or ligand dependence. This indicates a nuclear origin for the stochastic field. Since ${\tau }_{\varphi }$ is a property of the environment, we argue that it is a number common to similar types of MM. Therefore, ${\tau }_{\varphi }$ 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.

10 pages, 3 figures

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• Electromagnetic radiation emanating from the molecular nanomagnet Fe8
• Dynamics of large anisotropic spin in a sub-ohmic dissipative environment close to a quantum-phase transition
• NMR and ${\mu }^{+}$SR detection of unconventional spin dynamics in Er(trensal) and Dy(trensal) molecular magnets
• Landau-Zener tunneling for dephasing Lindblad evolutions