2007/06/22 by Amit Keren, Oren Shafir, Efrat Shimshoni +5 · 1 citation
Chemistry · Materials Science · Physics and Astronomy · #Advanced NMR Techniques and Applications #Lanthanide and Transition Metal Complexes #Magnetism in coordination complexes #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.98.257204
published as Phys. Rev. Lett. 98, 257204 (2007) · 10 pages, 3 figures
openalex publication_date 2007/06/22 · arxiv created 2007/06/26 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 \ensuremathτ_\ensuremathφ of molecular magnets. It is found that \ensuremathτ_\ensuremathφ\ensuremath∼10 nsec with no S or ligand dependence. This indicates a nuclear origin for the stochastic field. Since \ensuremathτ_\ensuremathφ is a property of the environment, we argue that it is a number common to similar types of MM. Therefore, \ensuremathτ_\ensuremathφ 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.