Abstract
We report a pulse electron spin resonance study of binuclear Mn molecular complexes whose magnetic properties are controlled by the ligand substitution. An electron spin echo in these complexes in the solid phase and also diluted in a frozen solution matrix was detected, and the spin decoherence time of Mn spins at different temperatures was determined. We observe a simple exponential relaxation in the latter samples and a nonexponential relaxation process in the former ones. The data analysis establishes the hyperfine coupling to the protons as an important source of the electron spin decoherence. Furthermore, the data clearly suggest an important role of the intermolecular spin-spin coupling for the relaxation. The influence of both mechanisms should be considered as limiting factors for coherent spin manipulation in molecular magnets with regard to their possible application for quantum computing.
- Received 8 April 2011
DOI:https://doi.org/10.1103/PhysRevB.84.092402
©2011 American Physical Society