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

References in corpus (2)

• Nuclear spin dynamics in the quantum regime of a single-molecule magnet
• Resonant photon absorption in the low spin molecule V15

Cited by in corpus (4)

• Dynamics and thermalization of the nuclear spin bath in the single-molecule magnet Mn12-ac: test for the theory of spin tunneling
• Persistent Spin Dynamics in the $S=1/2$ V${}_{15}$ Molecular Nano-Magnet
• 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