1.
Angew Chem Int Ed Engl
; 58(18): 5891-5896, 2019 Apr 23.
Article
in English
| MEDLINE
| ID: mdl-30786125
ABSTRACT
The azafullerene Tb2 @C79 N is found to be a single-molecule magnet with a high 100-s blocking temperature of magnetization of 24â K and large coercivity. Tb magnetic moments with an easy-axis single-ion magnetic anisotropy are strongly coupled by the unpaired spin of the single-electron Tb-Tb bond. Relaxation of magnetization in Tb2 @C79 N below 15â K proceeds via quantum tunneling of magnetization with the characteristic time τQTM =16 462±1230â s. At higher temperature, relaxation follows the Orbach mechanism with a barrier of 757±4â K, corresponding to the excited states, in which one of the Tb spins is flipped.